refactor: extract main runtime dependency builders

docs/subagents/INDEX.md

@@ -6,7 +6,7 @@ Read first. Keep concise.
 | ------------ | -------------- | ---------------------------------------------------- | --------- | ------------------------------------- | ---------------------- |
 | `codex-main` | `planner-exec` | `Fix frequency/N+1 regression in plugin --start flow` | `in_progress` | `docs/subagents/agents/codex-main.md` | `2026-02-19T19:36:46Z` |
 | `codex-config-validation-20260219T172015Z-iiyf` | `codex-config-validation` | `Find root cause of config validation error for ~/.config/SubMiner/config.jsonc` | `completed` | `docs/subagents/agents/codex-config-validation-20260219T172015Z-iiyf.md` | `2026-02-19T17:26:17Z` |
-| `codex-task85-20260219T233711Z-46hc` | `codex-task85` | `Resume TASK-85 maintainability refactor from latest handoff point` | `in_progress` | `docs/subagents/agents/codex-task85-20260219T233711Z-46hc.md` | `2026-02-20T05:50:43Z` |
+| `codex-task85-20260219T233711Z-46hc` | `codex-task85` | `Resume TASK-85 maintainability refactor from latest handoff point` | `in_progress` | `docs/subagents/agents/codex-task85-20260219T233711Z-46hc.md` | `2026-02-20T06:56:20Z` |
 | `codex-anilist-deeplink-20260219T233926Z` | `anilist-deeplink` | `Fix external subminer:// AniList callback handling from browser` | `done` | `docs/subagents/agents/codex-anilist-deeplink-20260219T233926Z.md` | `2026-02-19T23:59:21Z` |
 | `codex-texthooker-highlights-20260220T002354Z-927c` | `codex-texthooker-highlights` | `Add optional texthooker highlight toggles for known/n+1/frequency/JLPT` | `completed` | `docs/subagents/agents/codex-texthooker-highlights-20260220T002354Z-927c.md` | `2026-02-20T00:30:49Z` |
 | `codex-texthooker-ui-playwright-20260220T003827Z-k3p9` | `codex-texthooker-ui-playwright` | `Run Playwright MCP smoke/regression checks for texthooker-ui changes` | `completed` | `docs/subagents/agents/codex-texthooker-ui-playwright-20260220T003827Z-k3p9.md` | `2026-02-20T00:42:09Z` |

docs/subagents/agents/codex-task85-20260219T233711Z-46hc.md

@@ -193,6 +193,28 @@
 - `src/main/runtime/initial-args-main-deps.test.ts`
 - `src/main/runtime/mpv-main-event-main-deps.ts`
 - `src/main/runtime/mpv-main-event-main-deps.test.ts`
+- `src/main/runtime/subtitle-tokenization-main-deps.ts`
+- `src/main/runtime/subtitle-tokenization-main-deps.test.ts`
+- `src/main/runtime/secondary-sub-mode-main-deps.ts`
+- `src/main/runtime/secondary-sub-mode-main-deps.test.ts`
+- `src/main/runtime/overlay-runtime-main-actions.ts`
+- `src/main/runtime/overlay-runtime-main-actions.test.ts`
+- `src/main/runtime/jellyfin-client-info.ts`
+- `src/main/runtime/jellyfin-client-info.test.ts`
+- `src/main/runtime/startup-config-main-deps.ts`
+- `src/main/runtime/startup-config-main-deps.test.ts`
+- `src/main/runtime/app-ready-main-deps.ts`
+- `src/main/runtime/app-ready-main-deps.test.ts`
+- `src/main/runtime/startup-lifecycle-main-deps.ts`
+- `src/main/runtime/startup-lifecycle-main-deps.test.ts`
+- `src/main/runtime/startup-bootstrap-main-deps.ts`
+- `src/main/runtime/startup-bootstrap-main-deps.test.ts`
+- `src/main/runtime/cli-command-prechecks-main-deps.ts`
+- `src/main/runtime/cli-command-prechecks-main-deps.test.ts`
+- `src/main/runtime/field-grouping-resolver.ts`
+- `src/main/runtime/field-grouping-resolver.test.ts`
+- `src/main/runtime/mpv-jellyfin-defaults.ts`
+- `src/main/runtime/mpv-jellyfin-defaults.test.ts`
 
 ## Open Questions / Blockers
 
@@ -244,3 +266,27 @@
 - [2026-02-20T05:15:40Z] progress: extracted MPV main-event deps assembly into `src/main/runtime/mpv-main-event-main-deps.ts` (`createBuildBindMpvMainEventHandlersMainDepsHandler`) and rewired `bindMpvClientEventHandlers` setup in `src/main.ts`.
 - [2026-02-20T05:15:40Z] progress: `src/main.ts` currently 2653 LOC after this slice.
 - [2026-02-20T05:15:40Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/app-lifecycle-main-activate.test.js dist/main/runtime/initial-args-main-deps.test.js dist/main/runtime/app-lifecycle-actions.test.js dist/main/runtime/initial-args-handler.test.js dist/main/runtime/app-runtime-main-deps.test.js dist/main/runtime/mpv-main-event-main-deps.test.js dist/main/runtime/mpv-main-event-bindings.test.js dist/main/runtime/mpv-main-event-actions.test.js dist/main/runtime/mpv-client-event-bindings.test.js` pass (27/27).
+- [2026-02-20T05:31:05Z] progress: extracted subtitle tokenization/mecab-warmup deps assembly into `src/main/runtime/subtitle-tokenization-main-deps.ts` (`createBuildTokenizerDepsMainHandler`, `createCreateMecabTokenizerAndCheckMainHandler`, `createPrewarmSubtitleDictionariesMainHandler`) and rewired `tokenizeSubtitle`, `createMecabTokenizerAndCheck`, and `prewarmSubtitleDictionaries` in `src/main.ts`.
+- [2026-02-20T05:31:05Z] progress: extracted `cycleSecondarySubMode` deps assembly into `src/main/runtime/secondary-sub-mode-main-deps.ts` (`createBuildCycleSecondarySubModeMainDepsHandler`) and rewired `cycleSecondarySubMode` in `src/main.ts`.
+- [2026-02-20T05:31:05Z] progress: while implementing subtitle-tokenization deps, fixed strict typing to align parser promise shapes (`Promise<void>` ready + `Promise<boolean>` init) and Mecab availability return type.
+- [2026-02-20T05:31:05Z] progress: `src/main.ts` currently 2664 LOC after this slice.
+- [2026-02-20T05:31:05Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/subtitle-tokenization-main-deps.test.js dist/main/runtime/secondary-sub-mode-main-deps.test.js dist/main/runtime/startup-warmups.test.js` pass (7/7).
+- [2026-02-20T05:49:13Z] progress: extracted overlay runtime state/action wrappers into `src/main/runtime/overlay-runtime-main-actions.ts` (`createGetRuntimeOptionsStateHandler`, `createRestorePreviousSecondarySubVisibilityHandler`, `createBroadcastRuntimeOptionsChangedHandler`, `createSendToActiveOverlayWindowHandler`, `createSetOverlayDebugVisualizationEnabledHandler`, `createOpenRuntimeOptionsPaletteHandler`), and rewired corresponding `main.ts` functions to thin delegations.
+- [2026-02-20T05:49:13Z] progress: while adding tests, corrected strict typing to import `OverlayHostedModal` from `src/main/overlay-runtime.ts` and aligned `RuntimeOptionState` fixture shape.
+- [2026-02-20T05:49:13Z] progress: `src/main.ts` currently 2696 LOC after this slice.
+- [2026-02-20T05:49:13Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/overlay-runtime-main-actions.test.js dist/main/runtime/subtitle-tokenization-main-deps.test.js dist/main/runtime/secondary-sub-mode-main-deps.test.js` pass (12/12).
+- [2026-02-20T05:50:43Z] progress: extracted Jellyfin config/client info wrappers into `src/main/runtime/jellyfin-client-info.ts` (`createGetResolvedJellyfinConfigHandler`, `createGetJellyfinClientInfoHandler`) and rewired `getResolvedJellyfinConfig` + `getJellyfinClientInfo` in `src/main.ts`.
+- [2026-02-20T05:50:43Z] progress: fixed strict typing regressions by loosening helper input types to preserve call-site inference while keeping client-info output normalized to strings.
+- [2026-02-20T05:50:43Z] progress: `src/main.ts` currently 2702 LOC after this slice.
+- [2026-02-20T05:50:43Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/jellyfin-client-info.test.js dist/main/runtime/overlay-runtime-main-actions.test.js dist/main/runtime/subtitle-tokenization-main-deps.test.js` pass (14/14).
+- [2026-02-20T06:52:54Z] progress: extracted startup config handler deps assembly into `src/main/runtime/startup-config-main-deps.ts` and rewired `reloadConfigHandler` + `criticalConfigErrorHandler` setup in `src/main.ts`.
+- [2026-02-20T06:52:54Z] progress: extracted app-ready runner deps assembly into `src/main/runtime/app-ready-main-deps.ts` and lifted nested `createAppReadyRuntimeRunner(...)` input block to `appReadyRuntimeRunner` constant in `src/main.ts`.
+- [2026-02-20T06:52:54Z] progress: extracted app-lifecycle runner deps assembly into `src/main/runtime/startup-lifecycle-main-deps.ts` and lifted lifecycle runner wiring to `appLifecycleRuntimeRunner` constant in `src/main.ts`.
+- [2026-02-20T06:52:54Z] progress: extracted startup bootstrap deps assembly into `src/main/runtime/startup-bootstrap-main-deps.ts` and rewired `buildStartupBootstrapRuntimeFactoryDepsHandler` to compose through the new builder.
+- [2026-02-20T06:52:54Z] progress: `src/main.ts` currently 2723 LOC after this slice.
+- [2026-02-20T06:52:54Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/startup-bootstrap-main-deps.test.js dist/main/runtime/startup-bootstrap-deps-builder.test.js dist/main/runtime/startup-lifecycle-main-deps.test.js dist/main/runtime/app-ready-main-deps.test.js dist/main/runtime/startup-config-main-deps.test.js dist/core/services/startup-bootstrap.test.js dist/core/services/app-ready.test.js` pass (21/21).
+- [2026-02-20T06:56:20Z] progress: extracted CLI precheck deps assembly into `src/main/runtime/cli-command-prechecks-main-deps.ts` and rewired `handleCliCommand` to use a prebuilt `handleTexthookerOnlyModeTransitionHandler`.
+- [2026-02-20T06:56:20Z] progress: extracted field-grouping resolver state wrappers into `src/main/runtime/field-grouping-resolver.ts` and rewired `getFieldGroupingResolver` + `setFieldGroupingResolver` in `src/main.ts`.
+- [2026-02-20T06:56:20Z] progress: extracted `applyJellyfinMpvDefaults` and `getDefaultSocketPath` wrappers into `src/main/runtime/mpv-jellyfin-defaults.ts`; rewired both `main.ts` helper functions to thin handler delegates.
+- [2026-02-20T06:56:20Z] progress: `src/main.ts` currently 2742 LOC after this slice.
+- [2026-02-20T06:56:20Z] test: `bun run build` pass (expected macOS helper Swift cache fallback) + `node --test dist/main/runtime/cli-command-prechecks-main-deps.test.js dist/main/runtime/cli-command-prechecks.test.js dist/main/runtime/field-grouping-resolver.test.js dist/main/runtime/mpv-jellyfin-defaults.test.js dist/main/runtime/startup-bootstrap-main-deps.test.js` pass (11/11).

src/main.ts

@@ -148,6 +148,14 @@ import { createRunJellyfinCommandHandler } from './main/runtime/jellyfin-command
 import { createHandleJellyfinListCommands } from './main/runtime/jellyfin-cli-list';
 import { createHandleJellyfinPlayCommand } from './main/runtime/jellyfin-cli-play';
 import { createHandleJellyfinRemoteAnnounceCommand } from './main/runtime/jellyfin-cli-remote-announce';
+import {
+  createGetJellyfinClientInfoHandler,
+  createGetResolvedJellyfinConfigHandler,
+} from './main/runtime/jellyfin-client-info';
+import {
+  createApplyJellyfinMpvDefaultsHandler,
+  createGetDefaultSocketPathHandler,
+} from './main/runtime/mpv-jellyfin-defaults';
 import { createPlayJellyfinItemInMpvHandler } from './main/runtime/jellyfin-playback-launch';
 import { createPreloadJellyfinExternalSubtitlesHandler } from './main/runtime/jellyfin-subtitle-preload';
 import {
@@ -157,12 +165,22 @@ import {
 import { createHandleInitialArgsHandler } from './main/runtime/initial-args-handler';
 import { createBuildHandleInitialArgsMainDepsHandler } from './main/runtime/initial-args-main-deps';
 import { createHandleTexthookerOnlyModeTransitionHandler } from './main/runtime/cli-command-prechecks';
+import { createBuildHandleTexthookerOnlyModeTransitionMainDepsHandler } from './main/runtime/cli-command-prechecks-main-deps';
+import {
+  createGetFieldGroupingResolverHandler,
+  createSetFieldGroupingResolverHandler,
+} from './main/runtime/field-grouping-resolver';
 import { createCliCommandContext } from './main/runtime/cli-command-context';
 import { createBindMpvMainEventHandlersHandler } from './main/runtime/mpv-main-event-bindings';
 import { createBuildBindMpvMainEventHandlersMainDepsHandler } from './main/runtime/mpv-main-event-main-deps';
 import { createBuildMpvClientRuntimeServiceFactoryDepsHandler } from './main/runtime/mpv-client-runtime-service-main-deps';
 import { createMpvClientRuntimeServiceFactory } from './main/runtime/mpv-client-runtime-service';
 import { createUpdateMpvSubtitleRenderMetricsHandler } from './main/runtime/mpv-subtitle-render-metrics';
+import {
+  createBuildTokenizerDepsMainHandler,
+  createCreateMecabTokenizerAndCheckMainHandler,
+  createPrewarmSubtitleDictionariesMainHandler,
+} from './main/runtime/subtitle-tokenization-main-deps';
 import {
   createLaunchBackgroundWarmupTaskHandler,
   createStartBackgroundWarmupsHandler,
@@ -192,6 +210,7 @@ import {
   createBuildAppendToMpvLogMainDepsHandler,
   createBuildShowMpvOsdMainDepsHandler,
 } from './main/runtime/mpv-osd-log-main-deps';
+import { createBuildCycleSecondarySubModeMainDepsHandler } from './main/runtime/secondary-sub-mode-main-deps';
 import {
   createCancelNumericShortcutSessionHandler,
   createStartNumericShortcutSessionHandler,
@@ -226,6 +245,14 @@ import {
   createSetOverlayVisibleHandler,
   createToggleOverlayHandler,
 } from './main/runtime/overlay-main-actions';
+import {
+  createBroadcastRuntimeOptionsChangedHandler,
+  createGetRuntimeOptionsStateHandler,
+  createOpenRuntimeOptionsPaletteHandler,
+  createRestorePreviousSecondarySubVisibilityHandler,
+  createSendToActiveOverlayWindowHandler,
+  createSetOverlayDebugVisualizationEnabledHandler,
+} from './main/runtime/overlay-runtime-main-actions';
 import {
   createHandleMpvCommandFromIpcHandler,
   createRunSubsyncManualFromIpcHandler,
@@ -279,6 +306,13 @@ import {
   createConfigHotReloadMessageHandler,
   resolveSubtitleStyleForRenderer,
 } from './main/runtime/config-hot-reload-handlers';
+import {
+  createBuildCriticalConfigErrorMainDepsHandler,
+  createBuildReloadConfigMainDepsHandler,
+} from './main/runtime/startup-config-main-deps';
+import { createBuildAppReadyRuntimeMainDepsHandler } from './main/runtime/app-ready-main-deps';
+import { createBuildAppLifecycleRuntimeRunnerMainDepsHandler } from './main/runtime/startup-lifecycle-main-deps';
+import { createBuildStartupBootstrapMainDepsHandler } from './main/runtime/startup-bootstrap-main-deps';
 import {
   enforceUnsupportedWaylandMode,
   forceX11Backend,
@@ -429,14 +463,13 @@ let jellyfinMpvAutoLaunchInFlight: Promise<boolean> | null = null;
 let backgroundWarmupsStarted = false;
 let yomitanLoadInFlight: Promise<Extension | null> | null = null;
 
+const applyJellyfinMpvDefaultsHandler = createApplyJellyfinMpvDefaultsHandler({
+  sendMpvCommandRuntime: (client, command) => sendMpvCommandRuntime(client as never, command),
+  jellyfinLangPref: JELLYFIN_LANG_PREF,
+});
+
 function applyJellyfinMpvDefaults(client: MpvIpcClient): void {
-  sendMpvCommandRuntime(client, ['set_property', 'sub-auto', 'fuzzy']);
+  applyJellyfinMpvDefaultsHandler(client);
-  sendMpvCommandRuntime(client, ['set_property', 'aid', 'auto']);
-  sendMpvCommandRuntime(client, ['set_property', 'sid', 'auto']);
-  sendMpvCommandRuntime(client, ['set_property', 'secondary-sid', 'auto']);
-  sendMpvCommandRuntime(client, ['set_property', 'secondary-sub-visibility', 'no']);
-  sendMpvCommandRuntime(client, ['set_property', 'alang', JELLYFIN_LANG_PREF]);
-  sendMpvCommandRuntime(client, ['set_property', 'slang', JELLYFIN_LANG_PREF]);
 }
 
 const CONFIG_DIR = resolveConfigDir({
@@ -493,11 +526,12 @@ const appLogger = {
   },
 };
 
+const getDefaultSocketPathHandler = createGetDefaultSocketPathHandler({
+  platform: process.platform,
+});
+
 function getDefaultSocketPath(): string {
-  if (process.platform === 'win32') {
+  return getDefaultSocketPathHandler();
-    return '\\\\.\\pipe\\subminer-socket';
-  }
-  return '/tmp/subminer-socket';
 }
 
 if (!fs.existsSync(USER_DATA_PATH)) {
@@ -795,23 +829,29 @@ const frequencyDictionaryRuntime = createFrequencyDictionaryRuntimeService({
   },
 });
 
+const getFieldGroupingResolverHandler = createGetFieldGroupingResolverHandler({
+  getResolver: () => appState.fieldGroupingResolver,
+});
+
 function getFieldGroupingResolver(): ((choice: KikuFieldGroupingChoice) => void) | null {
-  return appState.fieldGroupingResolver;
+  return getFieldGroupingResolverHandler();
 }
 
+const setFieldGroupingResolverHandler = createSetFieldGroupingResolverHandler({
+  setResolver: (resolver) => {
+    appState.fieldGroupingResolver = resolver;
+  },
+  nextSequence: () => {
+    appState.fieldGroupingResolverSequence += 1;
+    return appState.fieldGroupingResolverSequence;
+  },
+  getSequence: () => appState.fieldGroupingResolverSequence,
+});
+
 function setFieldGroupingResolver(
   resolver: ((choice: KikuFieldGroupingChoice) => void) | null,
 ): void {
-  if (!resolver) {
+  setFieldGroupingResolverHandler(resolver);
-    appState.fieldGroupingResolver = null;
-    return;
-  }
-  const sequence = ++appState.fieldGroupingResolverSequence;
-  const wrappedResolver = (choice: KikuFieldGroupingChoice): void => {
-    if (sequence !== appState.fieldGroupingResolverSequence) return;
-    resolver(choice);
-  };
-  appState.fieldGroupingResolver = wrappedResolver;
 }
 
 const fieldGroupingOverlayRuntime = createFieldGroupingOverlayRuntime<OverlayHostedModal>({
@@ -880,71 +920,97 @@ const overlayVisibilityRuntime = createOverlayVisibilityRuntimeService({
   },
 });
 
+const getRuntimeOptionsStateHandler = createGetRuntimeOptionsStateHandler({
+  getRuntimeOptionsManager: () => appState.runtimeOptionsManager,
+});
+
 function getRuntimeOptionsState(): RuntimeOptionState[] {
-  if (!appState.runtimeOptionsManager) return [];
+  return getRuntimeOptionsStateHandler();
-  return appState.runtimeOptionsManager.listOptions();
 }
 
 function getOverlayWindows(): BrowserWindow[] {
   return overlayManager.getOverlayWindows();
 }
 
+const restorePreviousSecondarySubVisibilityHandler = createRestorePreviousSecondarySubVisibilityHandler(
+  {
+    getMpvClient: () => appState.mpvClient,
+  },
+);
+
 function restorePreviousSecondarySubVisibility(): void {
-  if (!appState.mpvClient || !appState.mpvClient.connected) return;
+  restorePreviousSecondarySubVisibilityHandler();
-  appState.mpvClient.restorePreviousSecondarySubVisibility();
 }
 
 function broadcastToOverlayWindows(channel: string, ...args: unknown[]): void {
   overlayManager.broadcastToOverlayWindows(channel, ...args);
 }
 
+const broadcastRuntimeOptionsChangedHandler = createBroadcastRuntimeOptionsChangedHandler({
+  broadcastRuntimeOptionsChangedRuntime,
+  getRuntimeOptionsState: () => getRuntimeOptionsState(),
+  broadcastToOverlayWindows: (channel, ...args) => broadcastToOverlayWindows(channel, ...args),
+});
+
 function broadcastRuntimeOptionsChanged(): void {
-  broadcastRuntimeOptionsChangedRuntime(
+  broadcastRuntimeOptionsChangedHandler();
-    () => getRuntimeOptionsState(),
-    (channel, ...args) => broadcastToOverlayWindows(channel, ...args),
-  );
 }
 
+const sendToActiveOverlayWindowHandler = createSendToActiveOverlayWindowHandler({
+  sendToActiveOverlayWindowRuntime: (channel, payload, runtimeOptions) =>
+    overlayModalRuntime.sendToActiveOverlayWindow(channel, payload, runtimeOptions),
+});
+
 function sendToActiveOverlayWindow(
   channel: string,
   payload?: unknown,
   runtimeOptions?: { restoreOnModalClose?: OverlayHostedModal },
 ): boolean {
-  return overlayModalRuntime.sendToActiveOverlayWindow(channel, payload, runtimeOptions);
+  return sendToActiveOverlayWindowHandler(channel, payload, runtimeOptions);
 }
 
-function setOverlayDebugVisualizationEnabled(enabled: boolean): void {
+const setOverlayDebugVisualizationEnabledHandler = createSetOverlayDebugVisualizationEnabledHandler(
-  setOverlayDebugVisualizationEnabledRuntime(
+  {
-    appState.overlayDebugVisualizationEnabled,
+    setOverlayDebugVisualizationEnabledRuntime,
-    enabled,
+    getCurrentEnabled: () => appState.overlayDebugVisualizationEnabled,
-    (next) => {
+    setCurrentEnabled: (next) => {
       appState.overlayDebugVisualizationEnabled = next;
     },
-    (channel, ...args) => broadcastToOverlayWindows(channel, ...args),
+    broadcastToOverlayWindows: (channel, ...args) => broadcastToOverlayWindows(channel, ...args),
-  );
+  },
+);
+
+function setOverlayDebugVisualizationEnabled(enabled: boolean): void {
+  setOverlayDebugVisualizationEnabledHandler(enabled);
 }
 
+const openRuntimeOptionsPaletteHandler = createOpenRuntimeOptionsPaletteHandler({
+  openRuntimeOptionsPaletteRuntime: () => overlayModalRuntime.openRuntimeOptionsPalette(),
+});
+
 function openRuntimeOptionsPalette(): void {
-  overlayModalRuntime.openRuntimeOptionsPalette();
+  openRuntimeOptionsPaletteHandler();
 }
 
 function getResolvedConfig() {
   return configService.getConfig();
 }
 
+const getResolvedJellyfinConfigHandler = createGetResolvedJellyfinConfigHandler({
+  getResolvedConfig: () => getResolvedConfig(),
+});
+
 function getResolvedJellyfinConfig() {
-  return getResolvedConfig().jellyfin;
+  return getResolvedJellyfinConfigHandler();
 }
 
+const getJellyfinClientInfoHandler = createGetJellyfinClientInfoHandler({
+  getResolvedJellyfinConfig: () => getResolvedJellyfinConfig(),
+  getDefaultJellyfinConfig: () => DEFAULT_CONFIG.jellyfin,
+});
+
 function getJellyfinClientInfo(config = getResolvedJellyfinConfig()) {
-  const clientName = config.clientName || DEFAULT_CONFIG.jellyfin.clientName;
+  return getJellyfinClientInfoHandler(config);
-  const clientVersion = config.clientVersion || DEFAULT_CONFIG.jellyfin.clientVersion;
-  const deviceId = config.deviceId || DEFAULT_CONFIG.jellyfin.deviceId;
-  return {
-    clientName,
-    clientVersion,
-    deviceId,
-  };
 }
 
 const waitForMpvConnected = createWaitForMpvConnectedHandler({
@@ -1553,162 +1619,176 @@ const restoreWindowsOnActivateHandler = createRestoreWindowsOnActivateHandler(
   })(),
 );
 
-const buildStartupBootstrapRuntimeFactoryDepsHandler =
+const reloadConfigHandler = createReloadConfigHandler(
-  createBuildStartupBootstrapRuntimeFactoryDepsHandler({
+  createBuildReloadConfigMainDepsHandler({
-    argv: process.argv,
+    reloadConfigStrict: () => configService.reloadConfigStrict(),
-    parseArgs: (argv: string[]) => parseArgs(argv),
+    logInfo: (message) => appLogger.logInfo(message),
-    setLogLevel: (level: string, source: LogLevelSource) => {
+    logWarning: (message) => appLogger.logWarning(message),
-      setLogLevel(level, source);
+    showDesktopNotification: (title, options) => showDesktopNotification(title, options),
+    startConfigHotReload: () => configHotReloadRuntime.start(),
+    refreshAnilistClientSecretState: (options) => refreshAnilistClientSecretState(options),
+    failHandlers: {
+      logError: (details) => logger.error(details),
+      showErrorBox: (title, details) => dialog.showErrorBox(title, details),
+      quit: () => app.quit(),
     },
-    forceX11Backend: (args: CliArgs) => {
+  })(),
-      forceX11Backend(args);
+);
+
+const criticalConfigErrorHandler = createCriticalConfigErrorHandler(
+  createBuildCriticalConfigErrorMainDepsHandler({
+    getConfigPath: () => configService.getConfigPath(),
+    failHandlers: {
+      logError: (message) => logger.error(message),
+      showErrorBox: (title, message) => dialog.showErrorBox(title, message),
+      quit: () => app.quit(),
     },
-    enforceUnsupportedWaylandMode: (args: CliArgs) => {
+  })(),
-      enforceUnsupportedWaylandMode(args);
+);
+
+const appReadyRuntimeRunner = createAppReadyRuntimeRunner(
+  createBuildAppReadyRuntimeMainDepsHandler({
+    loadSubtitlePosition: () => loadSubtitlePosition(),
+    resolveKeybindings: () => {
+      appState.keybindings = resolveKeybindings(getResolvedConfig(), DEFAULT_KEYBINDINGS);
     },
-    shouldStartApp: (args: CliArgs) => shouldStartApp(args),
+    createMpvClient: () => {
-    getDefaultSocketPath: () => getDefaultSocketPath(),
+      appState.mpvClient = createMpvClientRuntimeService();
-    defaultTexthookerPort: DEFAULT_TEXTHOOKER_PORT,
+    },
-    configDir: CONFIG_DIR,
+    reloadConfig: reloadConfigHandler,
-    defaultConfig: DEFAULT_CONFIG,
+    getResolvedConfig: () => getResolvedConfig(),
-    generateConfigTemplate: (config: ResolvedConfig) => generateConfigTemplate(config),
+    getConfigWarnings: () => configService.getWarnings(),
-    generateDefaultConfigFile: (
+    logConfigWarning: (warning) => appLogger.logConfigWarning(warning),
-      args: CliArgs,
+    setLogLevel: (level: string, source: LogLevelSource) => setLogLevel(level, source),
-      options: {
+    initRuntimeOptionsManager: () => {
-        configDir: string;
+      appState.runtimeOptionsManager = new RuntimeOptionsManager(
-        defaultConfig: unknown;
+        () => configService.getConfig().ankiConnect,
-        generateTemplate: (config: unknown) => string;
+        {
+          applyAnkiPatch: (patch) => {
+            if (appState.ankiIntegration) {
+              appState.ankiIntegration.applyRuntimeConfigPatch(patch);
+            }
+          },
+          onOptionsChanged: () => {
+            broadcastRuntimeOptionsChanged();
+            refreshOverlayShortcuts();
+          },
+        },
+      );
+    },
+    setSecondarySubMode: (mode: SecondarySubMode) => {
+      appState.secondarySubMode = mode;
+    },
+    defaultSecondarySubMode: 'hover',
+    defaultWebsocketPort: DEFAULT_CONFIG.websocket.port,
+    hasMpvWebsocketPlugin: () => hasMpvWebsocketPlugin(),
+    startSubtitleWebsocket: (port: number) => {
+      subtitleWsService.start(port, () => appState.currentSubText);
+    },
+    log: (message) => appLogger.logInfo(message),
+    createMecabTokenizerAndCheck: async () => {
+      await createMecabTokenizerAndCheck();
+    },
+    createSubtitleTimingTracker: () => {
+      const tracker = new SubtitleTimingTracker();
+      appState.subtitleTimingTracker = tracker;
+    },
+    createImmersionTracker: createImmersionTrackerStartupHandler({
+      getResolvedConfig: () => getResolvedConfig(),
+      getConfiguredDbPath: () => immersionMediaRuntime.getConfiguredDbPath(),
+      createTrackerService: (params) => new ImmersionTrackerService(params),
+      setTracker: (tracker) => {
+        appState.immersionTracker = tracker as ImmersionTrackerService | null;
       },
-    ) => generateDefaultConfigFile(args, options),
+      getMpvClient: () => appState.mpvClient,
-    onConfigGenerated: (exitCode: number) => {
+      seedTrackerFromCurrentMedia: () => {
-      process.exitCode = exitCode;
+        void immersionMediaRuntime.seedFromCurrentMedia();
-      app.quit();
+      },
-    },
+      logInfo: (message) => logger.info(message),
-    onGenerateConfigError: (error: Error) => {
+      logDebug: (message) => logger.debug(message),
-      logger.error(`Failed to generate config: ${error.message}`);
+      logWarn: (message, details) => logger.warn(message, details),
-      process.exitCode = 1;
-      app.quit();
-    },
-    startAppLifecycle: createAppLifecycleRuntimeRunner({
-      app,
-      platform: process.platform,
-      shouldStartApp: (nextArgs: CliArgs) => shouldStartApp(nextArgs),
-      parseArgs: (argv: string[]) => parseArgs(argv),
-      handleCliCommand: (nextArgs: CliArgs, source: CliCommandSource) =>
-        handleCliCommand(nextArgs, source),
-      printHelp: () => printHelp(DEFAULT_TEXTHOOKER_PORT),
-      logNoRunningInstance: () => appLogger.logNoRunningInstance(),
-      onReady: createAppReadyRuntimeRunner({
-        loadSubtitlePosition: () => loadSubtitlePosition(),
-        resolveKeybindings: () => {
-          appState.keybindings = resolveKeybindings(getResolvedConfig(), DEFAULT_KEYBINDINGS);
-        },
-        createMpvClient: () => {
-          appState.mpvClient = createMpvClientRuntimeService();
-        },
-        reloadConfig: createReloadConfigHandler({
-          reloadConfigStrict: () => configService.reloadConfigStrict(),
-          logInfo: (message) => appLogger.logInfo(message),
-          logWarning: (message) => appLogger.logWarning(message),
-          showDesktopNotification: (title, options) => showDesktopNotification(title, options),
-          startConfigHotReload: () => configHotReloadRuntime.start(),
-          refreshAnilistClientSecretState: (options) => refreshAnilistClientSecretState(options),
-          failHandlers: {
-            logError: (details) => logger.error(details),
-            showErrorBox: (title, details) => dialog.showErrorBox(title, details),
-            quit: () => app.quit(),
-          },
-        }),
-        getResolvedConfig: () => getResolvedConfig(),
-        getConfigWarnings: () => configService.getWarnings(),
-        logConfigWarning: (warning) => appLogger.logConfigWarning(warning),
-        setLogLevel: (level: string, source: LogLevelSource) => setLogLevel(level, source),
-        initRuntimeOptionsManager: () => {
-          appState.runtimeOptionsManager = new RuntimeOptionsManager(
-            () => configService.getConfig().ankiConnect,
-            {
-              applyAnkiPatch: (patch) => {
-                if (appState.ankiIntegration) {
-                  appState.ankiIntegration.applyRuntimeConfigPatch(patch);
-                }
-              },
-              onOptionsChanged: () => {
-                broadcastRuntimeOptionsChanged();
-                refreshOverlayShortcuts();
-              },
-            },
-          );
-        },
-        setSecondarySubMode: (mode: SecondarySubMode) => {
-          appState.secondarySubMode = mode;
-        },
-        defaultSecondarySubMode: 'hover',
-        defaultWebsocketPort: DEFAULT_CONFIG.websocket.port,
-        hasMpvWebsocketPlugin: () => hasMpvWebsocketPlugin(),
-        startSubtitleWebsocket: (port: number) => {
-          subtitleWsService.start(port, () => appState.currentSubText);
-        },
-        log: (message) => appLogger.logInfo(message),
-        createMecabTokenizerAndCheck: async () => {
-          await createMecabTokenizerAndCheck();
-        },
-        createSubtitleTimingTracker: () => {
-          const tracker = new SubtitleTimingTracker();
-          appState.subtitleTimingTracker = tracker;
-        },
-        createImmersionTracker: createImmersionTrackerStartupHandler({
-          getResolvedConfig: () => getResolvedConfig(),
-          getConfiguredDbPath: () => immersionMediaRuntime.getConfiguredDbPath(),
-          createTrackerService: (params) => new ImmersionTrackerService(params),
-          setTracker: (tracker) => {
-            appState.immersionTracker = tracker as ImmersionTrackerService | null;
-          },
-          getMpvClient: () => appState.mpvClient,
-          seedTrackerFromCurrentMedia: () => {
-            void immersionMediaRuntime.seedFromCurrentMedia();
-          },
-          logInfo: (message) => logger.info(message),
-          logDebug: (message) => logger.debug(message),
-          logWarn: (message, details) => logger.warn(message, details),
-        }),
-        loadYomitanExtension: async () => {
-          await loadYomitanExtension();
-        },
-        startJellyfinRemoteSession: async () => {
-          await startJellyfinRemoteSession();
-        },
-        prewarmSubtitleDictionaries: async () => {
-          await prewarmSubtitleDictionaries();
-        },
-        startBackgroundWarmups: () => {
-          startBackgroundWarmups();
-        },
-        texthookerOnlyMode: appState.texthookerOnlyMode,
-        shouldAutoInitializeOverlayRuntimeFromConfig: () =>
-          appState.backgroundMode
-            ? false
-            : configDerivedRuntime.shouldAutoInitializeOverlayRuntimeFromConfig(),
-        initializeOverlayRuntime: () => initializeOverlayRuntime(),
-        handleInitialArgs: () => handleInitialArgs(),
-        onCriticalConfigErrors: createCriticalConfigErrorHandler({
-          getConfigPath: () => configService.getConfigPath(),
-          failHandlers: {
-            logError: (message) => logger.error(message),
-            showErrorBox: (title, message) => dialog.showErrorBox(title, message),
-            quit: () => app.quit(),
-          },
-        }),
-        logDebug: (message: string) => {
-          logger.debug(message);
-        },
-        now: () => Date.now(),
-      }),
-      onWillQuitCleanup: () => onWillQuitCleanupHandler(),
-      shouldRestoreWindowsOnActivate: () => shouldRestoreWindowsOnActivateHandler(),
-      restoreWindowsOnActivate: () => restoreWindowsOnActivateHandler(),
-      shouldQuitOnWindowAllClosed: () => !appState.backgroundMode,
     }),
-  });
+    loadYomitanExtension: async () => {
+      await loadYomitanExtension();
+    },
+    startJellyfinRemoteSession: async () => {
+      await startJellyfinRemoteSession();
+    },
+    prewarmSubtitleDictionaries: async () => {
+      await prewarmSubtitleDictionaries();
+    },
+    startBackgroundWarmups: () => {
+      startBackgroundWarmups();
+    },
+    texthookerOnlyMode: appState.texthookerOnlyMode,
+    shouldAutoInitializeOverlayRuntimeFromConfig: () =>
+      appState.backgroundMode
+        ? false
+        : configDerivedRuntime.shouldAutoInitializeOverlayRuntimeFromConfig(),
+    initializeOverlayRuntime: () => initializeOverlayRuntime(),
+    handleInitialArgs: () => handleInitialArgs(),
+    onCriticalConfigErrors: criticalConfigErrorHandler,
+    logDebug: (message: string) => {
+      logger.debug(message);
+    },
+    now: () => Date.now(),
+  })(),
+);
+
+const appLifecycleRuntimeRunner = createAppLifecycleRuntimeRunner(
+  createBuildAppLifecycleRuntimeRunnerMainDepsHandler({
+    app,
+    platform: process.platform,
+    shouldStartApp: (nextArgs: CliArgs) => shouldStartApp(nextArgs),
+    parseArgs: (argv: string[]) => parseArgs(argv),
+    handleCliCommand: (nextArgs: CliArgs, source: CliCommandSource) =>
+      handleCliCommand(nextArgs, source),
+    printHelp: () => printHelp(DEFAULT_TEXTHOOKER_PORT),
+    logNoRunningInstance: () => appLogger.logNoRunningInstance(),
+    onReady: appReadyRuntimeRunner,
+    onWillQuitCleanup: () => onWillQuitCleanupHandler(),
+    shouldRestoreWindowsOnActivate: () => shouldRestoreWindowsOnActivateHandler(),
+    restoreWindowsOnActivate: () => restoreWindowsOnActivateHandler(),
+    shouldQuitOnWindowAllClosed: () => !appState.backgroundMode,
+  })(),
+);
+
+const buildStartupBootstrapRuntimeFactoryDepsHandler =
+  createBuildStartupBootstrapRuntimeFactoryDepsHandler(
+    createBuildStartupBootstrapMainDepsHandler({
+      argv: process.argv,
+      parseArgs: (argv: string[]) => parseArgs(argv),
+      setLogLevel: (level: string, source: LogLevelSource) => {
+        setLogLevel(level, source);
+      },
+      forceX11Backend: (args: CliArgs) => {
+        forceX11Backend(args);
+      },
+      enforceUnsupportedWaylandMode: (args: CliArgs) => {
+        enforceUnsupportedWaylandMode(args);
+      },
+      shouldStartApp: (args: CliArgs) => shouldStartApp(args),
+      getDefaultSocketPath: () => getDefaultSocketPath(),
+      defaultTexthookerPort: DEFAULT_TEXTHOOKER_PORT,
+      configDir: CONFIG_DIR,
+      defaultConfig: DEFAULT_CONFIG,
+      generateConfigTemplate: (config: ResolvedConfig) => generateConfigTemplate(config),
+      generateDefaultConfigFile: (
+        args: CliArgs,
+        options: {
+          configDir: string;
+          defaultConfig: unknown;
+          generateTemplate: (config: unknown) => string;
+        },
+      ) => generateDefaultConfigFile(args, options),
+      setExitCode: (code) => {
+        process.exitCode = code;
+      },
+      quitApp: () => app.quit(),
+      logGenerateConfigError: (message) => logger.error(message),
+      startAppLifecycle: appLifecycleRuntimeRunner,
+    })(),
+  );
 
 const startupState = runStartupBootstrapRuntime(
   createStartupBootstrapRuntimeDeps(buildStartupBootstrapRuntimeFactoryDepsHandler()),
@@ -1718,16 +1798,20 @@ applyStartupState(appState, startupState);
 void refreshAnilistClientSecretState({ force: true });
 anilistStateRuntime.refreshRetryQueueState();
 
-function handleCliCommand(args: CliArgs, source: CliCommandSource = 'initial'): void {
+const handleTexthookerOnlyModeTransitionHandler = createHandleTexthookerOnlyModeTransitionHandler(
-  createHandleTexthookerOnlyModeTransitionHandler({
+  createBuildHandleTexthookerOnlyModeTransitionMainDepsHandler({
     isTexthookerOnlyMode: () => appState.texthookerOnlyMode,
     setTexthookerOnlyMode: (enabled) => {
       appState.texthookerOnlyMode = enabled;
     },
     commandNeedsOverlayRuntime: (inputArgs) => commandNeedsOverlayRuntime(inputArgs),
     startBackgroundWarmups: () => startBackgroundWarmups(),
-    logInfo: (message) => logger.info(message),
+    logInfo: (message: string) => logger.info(message),
-  })(args);
+  })(),
+);
+
+function handleCliCommand(args: CliArgs, source: CliCommandSource = 'initial'): void {
+  handleTexthookerOnlyModeTransitionHandler(args);
 
   const cliContext = createCliCommandContext(buildCliCommandContextDepsHandler());
   handleCliCommandRuntimeServiceWithContext(args, source, cliContext);
@@ -1833,59 +1917,62 @@ function updateMpvSubtitleRenderMetrics(patch: Partial<MpvSubtitleRenderMetrics>
   updateMpvSubtitleRenderMetricsRuntime(patch);
 }
 
+const buildTokenizerDepsHandler = createBuildTokenizerDepsMainHandler({
+  getYomitanExt: () => appState.yomitanExt,
+  getYomitanParserWindow: () => appState.yomitanParserWindow,
+  setYomitanParserWindow: (window) => {
+    appState.yomitanParserWindow = window as BrowserWindow | null;
+  },
+  getYomitanParserReadyPromise: () => appState.yomitanParserReadyPromise,
+  setYomitanParserReadyPromise: (promise) => {
+    appState.yomitanParserReadyPromise = promise;
+  },
+  getYomitanParserInitPromise: () => appState.yomitanParserInitPromise,
+  setYomitanParserInitPromise: (promise) => {
+    appState.yomitanParserInitPromise = promise;
+  },
+  isKnownWord: (text) => Boolean(appState.ankiIntegration?.isKnownWord(text)),
+  recordLookup: (hit) => {
+    appState.immersionTracker?.recordLookup(hit);
+  },
+  getKnownWordMatchMode: () =>
+    appState.ankiIntegration?.getKnownWordMatchMode() ??
+    getResolvedConfig().ankiConnect.nPlusOne.matchMode,
+  getMinSentenceWordsForNPlusOne: () => getResolvedConfig().ankiConnect.nPlusOne.minSentenceWords,
+  getJlptLevel: (text) => appState.jlptLevelLookup(text),
+  getJlptEnabled: () => getResolvedConfig().subtitleStyle.enableJlpt,
+  getFrequencyDictionaryEnabled: () => getResolvedConfig().subtitleStyle.frequencyDictionary.enabled,
+  getFrequencyRank: (text) => appState.frequencyRankLookup(text),
+  getYomitanGroupDebugEnabled: () => appState.overlayDebugVisualizationEnabled,
+  getMecabTokenizer: () => appState.mecabTokenizer,
+});
+
+const createMecabTokenizerAndCheckHandler = createCreateMecabTokenizerAndCheckMainHandler({
+  getMecabTokenizer: () => appState.mecabTokenizer,
+  setMecabTokenizer: (tokenizer) => {
+    appState.mecabTokenizer = tokenizer;
+  },
+  createMecabTokenizer: () => new MecabTokenizer(),
+  checkAvailability: async (tokenizer) => tokenizer.checkAvailability(),
+});
+
+const prewarmSubtitleDictionariesHandler = createPrewarmSubtitleDictionariesMainHandler({
+  ensureJlptDictionaryLookup: () => jlptDictionaryRuntime.ensureJlptDictionaryLookup(),
+  ensureFrequencyDictionaryLookup: () => frequencyDictionaryRuntime.ensureFrequencyDictionaryLookup(),
+});
+
 async function tokenizeSubtitle(text: string): Promise<SubtitleData> {
   await jlptDictionaryRuntime.ensureJlptDictionaryLookup();
   await frequencyDictionaryRuntime.ensureFrequencyDictionaryLookup();
-  return tokenizeSubtitleCore(
+  return tokenizeSubtitleCore(text, createTokenizerDepsRuntime(buildTokenizerDepsHandler()));
-    text,
-    createTokenizerDepsRuntime({
-      getYomitanExt: () => appState.yomitanExt,
-      getYomitanParserWindow: () => appState.yomitanParserWindow,
-      setYomitanParserWindow: (window) => {
-        appState.yomitanParserWindow = window;
-      },
-      getYomitanParserReadyPromise: () => appState.yomitanParserReadyPromise,
-      setYomitanParserReadyPromise: (promise) => {
-        appState.yomitanParserReadyPromise = promise;
-      },
-      getYomitanParserInitPromise: () => appState.yomitanParserInitPromise,
-      setYomitanParserInitPromise: (promise) => {
-        appState.yomitanParserInitPromise = promise;
-      },
-      isKnownWord: (text) =>
-        (() => {
-          const hit = Boolean(appState.ankiIntegration?.isKnownWord(text));
-          appState.immersionTracker?.recordLookup(hit);
-          return hit;
-        })(),
-      getKnownWordMatchMode: () =>
-        appState.ankiIntegration?.getKnownWordMatchMode() ??
-        getResolvedConfig().ankiConnect.nPlusOne.matchMode,
-      getMinSentenceWordsForNPlusOne: () =>
-        getResolvedConfig().ankiConnect.nPlusOne.minSentenceWords,
-      getJlptLevel: (text) => appState.jlptLevelLookup(text),
-      getJlptEnabled: () => getResolvedConfig().subtitleStyle.enableJlpt,
-      getFrequencyDictionaryEnabled: () =>
-        getResolvedConfig().subtitleStyle.frequencyDictionary.enabled,
-      getFrequencyRank: (text) => appState.frequencyRankLookup(text),
-      getYomitanGroupDebugEnabled: () => appState.overlayDebugVisualizationEnabled,
-      getMecabTokenizer: () => appState.mecabTokenizer,
-    }),
-  );
 }
 
 async function createMecabTokenizerAndCheck(): Promise<void> {
-  if (!appState.mecabTokenizer) {
+  await createMecabTokenizerAndCheckHandler();
-    appState.mecabTokenizer = new MecabTokenizer();
-  }
-  await appState.mecabTokenizer.checkAvailability();
 }
 
 async function prewarmSubtitleDictionaries(): Promise<void> {
-  await Promise.all([
+  await prewarmSubtitleDictionariesHandler();
-    jlptDictionaryRuntime.ensureJlptDictionaryLookup(),
-    frequencyDictionaryRuntime.ensureFrequencyDictionaryLookup(),
-  ]);
 }
 
 const launchBackgroundWarmupTask = createLaunchBackgroundWarmupTaskHandler({
@@ -2020,20 +2107,22 @@ function getConfiguredShortcuts() {
 }
 
 function cycleSecondarySubMode(): void {
-  cycleSecondarySubModeCore({
+  cycleSecondarySubModeCore(
-    getSecondarySubMode: () => appState.secondarySubMode,
+    createBuildCycleSecondarySubModeMainDepsHandler({
-    setSecondarySubMode: (mode: SecondarySubMode) => {
+      getSecondarySubMode: () => appState.secondarySubMode,
-      appState.secondarySubMode = mode;
+      setSecondarySubMode: (mode: SecondarySubMode) => {
-    },
+        appState.secondarySubMode = mode;
-    getLastSecondarySubToggleAtMs: () => appState.lastSecondarySubToggleAtMs,
+      },
-    setLastSecondarySubToggleAtMs: (timestampMs: number) => {
+      getLastSecondarySubToggleAtMs: () => appState.lastSecondarySubToggleAtMs,
-      appState.lastSecondarySubToggleAtMs = timestampMs;
+      setLastSecondarySubToggleAtMs: (timestampMs: number) => {
-    },
+        appState.lastSecondarySubToggleAtMs = timestampMs;
-    broadcastSecondarySubMode: (mode: SecondarySubMode) => {
+      },
-      broadcastToOverlayWindows('secondary-subtitle:mode', mode);
+      broadcastToOverlayWindows: (channel, mode) => {
-    },
+        broadcastToOverlayWindows(channel, mode);
-    showMpvOsd: (text: string) => showMpvOsd(text),
+      },
-  });
+      showMpvOsd: (text: string) => showMpvOsd(text),
+    })(),
+  );
 }
 
 const appendToMpvLogHandler = createAppendToMpvLogHandler({

src/main/runtime/app-ready-main-deps.test.ts

@@ -0,0 +1,71 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createBuildAppReadyRuntimeMainDepsHandler } from './app-ready-main-deps';
+
+test('app-ready main deps builder returns mapped app-ready runtime deps', async () => {
+  const calls: string[] = [];
+  const onReady = createBuildAppReadyRuntimeMainDepsHandler({
+    loadSubtitlePosition: () => calls.push('load-subtitle-position'),
+    resolveKeybindings: () => calls.push('resolve-keybindings'),
+    createMpvClient: () => calls.push('create-mpv-client'),
+    reloadConfig: () => calls.push('reload-config'),
+    getResolvedConfig: () => ({ websocket: {} }),
+    getConfigWarnings: () => [],
+    logConfigWarning: () => calls.push('log-config-warning'),
+    initRuntimeOptionsManager: () => calls.push('init-runtime-options'),
+    setSecondarySubMode: () => calls.push('set-secondary-sub-mode'),
+    defaultSecondarySubMode: 'hover',
+    defaultWebsocketPort: 5174,
+    hasMpvWebsocketPlugin: () => false,
+    startSubtitleWebsocket: () => calls.push('start-ws'),
+    log: () => calls.push('log'),
+    setLogLevel: () => calls.push('set-log-level'),
+    createMecabTokenizerAndCheck: async () => {
+      calls.push('create-mecab');
+    },
+    createSubtitleTimingTracker: () => calls.push('create-subtitle-tracker'),
+    createImmersionTracker: () => calls.push('create-immersion'),
+    startJellyfinRemoteSession: async () => {
+      calls.push('start-jellyfin');
+    },
+    loadYomitanExtension: async () => {
+      calls.push('load-yomitan');
+    },
+    prewarmSubtitleDictionaries: async () => {
+      calls.push('prewarm-dicts');
+    },
+    startBackgroundWarmups: () => calls.push('start-warmups'),
+    texthookerOnlyMode: false,
+    shouldAutoInitializeOverlayRuntimeFromConfig: () => true,
+    initializeOverlayRuntime: () => calls.push('init-overlay'),
+    handleInitialArgs: () => calls.push('handle-initial-args'),
+    onCriticalConfigErrors: () => {
+      throw new Error('should not call');
+    },
+    logDebug: () => calls.push('debug'),
+    now: () => 123,
+  })();
+
+  assert.equal(onReady.defaultSecondarySubMode, 'hover');
+  assert.equal(onReady.defaultWebsocketPort, 5174);
+  assert.equal(onReady.texthookerOnlyMode, false);
+  assert.equal(onReady.shouldAutoInitializeOverlayRuntimeFromConfig(), true);
+  assert.equal(onReady.now?.(), 123);
+  onReady.loadSubtitlePosition();
+  onReady.resolveKeybindings();
+  onReady.createMpvClient();
+  await onReady.createMecabTokenizerAndCheck();
+  await onReady.loadYomitanExtension();
+  await onReady.prewarmSubtitleDictionaries?.();
+  onReady.startBackgroundWarmups();
+
+  assert.deepEqual(calls, [
+    'load-subtitle-position',
+    'resolve-keybindings',
+    'create-mpv-client',
+    'create-mecab',
+    'load-yomitan',
+    'prewarm-dicts',
+    'start-warmups',
+  ]);
+});

src/main/runtime/app-ready-main-deps.ts

@@ -0,0 +1,38 @@
+import type { AppReadyRuntimeDepsFactoryInput } from '../app-lifecycle';
+
+export function createBuildAppReadyRuntimeMainDepsHandler(
+  deps: AppReadyRuntimeDepsFactoryInput,
+) {
+  return (): AppReadyRuntimeDepsFactoryInput => ({
+    loadSubtitlePosition: deps.loadSubtitlePosition,
+    resolveKeybindings: deps.resolveKeybindings,
+    createMpvClient: deps.createMpvClient,
+    reloadConfig: deps.reloadConfig,
+    getResolvedConfig: deps.getResolvedConfig,
+    getConfigWarnings: deps.getConfigWarnings,
+    logConfigWarning: deps.logConfigWarning,
+    initRuntimeOptionsManager: deps.initRuntimeOptionsManager,
+    setSecondarySubMode: deps.setSecondarySubMode,
+    defaultSecondarySubMode: deps.defaultSecondarySubMode,
+    defaultWebsocketPort: deps.defaultWebsocketPort,
+    hasMpvWebsocketPlugin: deps.hasMpvWebsocketPlugin,
+    startSubtitleWebsocket: deps.startSubtitleWebsocket,
+    log: deps.log,
+    setLogLevel: deps.setLogLevel,
+    createMecabTokenizerAndCheck: deps.createMecabTokenizerAndCheck,
+    createSubtitleTimingTracker: deps.createSubtitleTimingTracker,
+    createImmersionTracker: deps.createImmersionTracker,
+    startJellyfinRemoteSession: deps.startJellyfinRemoteSession,
+    loadYomitanExtension: deps.loadYomitanExtension,
+    prewarmSubtitleDictionaries: deps.prewarmSubtitleDictionaries,
+    startBackgroundWarmups: deps.startBackgroundWarmups,
+    texthookerOnlyMode: deps.texthookerOnlyMode,
+    shouldAutoInitializeOverlayRuntimeFromConfig:
+      deps.shouldAutoInitializeOverlayRuntimeFromConfig,
+    initializeOverlayRuntime: deps.initializeOverlayRuntime,
+    handleInitialArgs: deps.handleInitialArgs,
+    onCriticalConfigErrors: deps.onCriticalConfigErrors,
+    logDebug: deps.logDebug,
+    now: deps.now,
+  });
+}

src/main/runtime/cli-command-prechecks-main-deps.test.ts

@@ -0,0 +1,21 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createBuildHandleTexthookerOnlyModeTransitionMainDepsHandler } from './cli-command-prechecks-main-deps';
+
+test('cli prechecks main deps builder maps transition handlers', () => {
+  const calls: string[] = [];
+  const deps = createBuildHandleTexthookerOnlyModeTransitionMainDepsHandler({
+    isTexthookerOnlyMode: () => true,
+    setTexthookerOnlyMode: (enabled) => calls.push(`set:${enabled}`),
+    commandNeedsOverlayRuntime: () => true,
+    startBackgroundWarmups: () => calls.push('warmups'),
+    logInfo: (message) => calls.push(`info:${message}`),
+  })();
+
+  assert.equal(deps.isTexthookerOnlyMode(), true);
+  assert.equal(deps.commandNeedsOverlayRuntime({} as never), true);
+  deps.setTexthookerOnlyMode(false);
+  deps.startBackgroundWarmups();
+  deps.logInfo('x');
+  assert.deepEqual(calls, ['set:false', 'warmups', 'info:x']);
+});

src/main/runtime/cli-command-prechecks-main-deps.ts

@@ -0,0 +1,17 @@
+import type { CliArgs } from '../../cli/args';
+
+export function createBuildHandleTexthookerOnlyModeTransitionMainDepsHandler(deps: {
+  isTexthookerOnlyMode: () => boolean;
+  setTexthookerOnlyMode: (enabled: boolean) => void;
+  commandNeedsOverlayRuntime: (args: CliArgs) => boolean;
+  startBackgroundWarmups: () => void;
+  logInfo: (message: string) => void;
+}) {
+  return () => ({
+    isTexthookerOnlyMode: () => deps.isTexthookerOnlyMode(),
+    setTexthookerOnlyMode: (enabled: boolean) => deps.setTexthookerOnlyMode(enabled),
+    commandNeedsOverlayRuntime: (args: CliArgs) => deps.commandNeedsOverlayRuntime(args),
+    startBackgroundWarmups: () => deps.startBackgroundWarmups(),
+    logInfo: (message: string) => deps.logInfo(message),
+  });
+}

src/main/runtime/field-grouping-resolver.test.ts

@@ -0,0 +1,56 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createGetFieldGroupingResolverHandler,
+  createSetFieldGroupingResolverHandler,
+} from './field-grouping-resolver';
+
+test('get field grouping resolver returns current resolver', () => {
+  const resolver = () => undefined;
+  const getResolver = createGetFieldGroupingResolverHandler({
+    getResolver: () => resolver,
+  });
+
+  assert.equal(getResolver(), resolver);
+});
+
+test('set field grouping resolver clears resolver when null is provided', () => {
+  let current: ((choice: unknown) => void) | null = () => undefined;
+  const setResolver = createSetFieldGroupingResolverHandler({
+    setResolver: (resolver) => {
+      current = resolver as never;
+    },
+    nextSequence: () => 1,
+    getSequence: () => 1,
+  });
+
+  setResolver(null);
+  assert.equal(current, null);
+});
+
+test('set field grouping resolver wraps resolver and ignores stale sequence', () => {
+  const calls: string[] = [];
+  let current: ((choice: unknown) => void) | null = null;
+  let sequence = 0;
+
+  const setResolver = createSetFieldGroupingResolverHandler({
+    setResolver: (resolver) => {
+      current = resolver as never;
+    },
+    nextSequence: () => {
+      sequence += 1;
+      return sequence;
+    },
+    getSequence: () => sequence,
+  });
+
+  setResolver((choice) => calls.push(`new:${choice}`));
+  const firstWrapped = current!;
+  setResolver((choice) => calls.push(`latest:${choice}`));
+  const latestWrapped = current!;
+
+  firstWrapped('A');
+  latestWrapped('B');
+
+  assert.deepEqual(calls, ['latest:B']);
+});

src/main/runtime/field-grouping-resolver.ts

@@ -0,0 +1,29 @@
+import type { KikuFieldGroupingChoice } from '../../types';
+
+type FieldGroupingResolver = ((choice: KikuFieldGroupingChoice) => void) | null;
+
+export function createGetFieldGroupingResolverHandler(deps: {
+  getResolver: () => FieldGroupingResolver;
+}) {
+  return (): FieldGroupingResolver => deps.getResolver();
+}
+
+export function createSetFieldGroupingResolverHandler(deps: {
+  setResolver: (resolver: FieldGroupingResolver) => void;
+  nextSequence: () => number;
+  getSequence: () => number;
+}) {
+  return (resolver: FieldGroupingResolver): void => {
+    if (!resolver) {
+      deps.setResolver(null);
+      return;
+    }
+
+    const sequence = deps.nextSequence();
+    const wrappedResolver = (choice: KikuFieldGroupingChoice): void => {
+      if (sequence !== deps.getSequence()) return;
+      resolver(choice);
+    };
+    deps.setResolver(wrappedResolver);
+  };
+}

src/main/runtime/jellyfin-client-info.test.ts

@@ -0,0 +1,56 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createGetJellyfinClientInfoHandler,
+  createGetResolvedJellyfinConfigHandler,
+} from './jellyfin-client-info';
+
+test('get resolved jellyfin config returns jellyfin section from resolved config', () => {
+  const jellyfin = { url: 'https://jellyfin.local' } as never;
+  const getConfig = createGetResolvedJellyfinConfigHandler({
+    getResolvedConfig: () => ({ jellyfin } as never),
+  });
+
+  assert.equal(getConfig(), jellyfin);
+});
+
+test('jellyfin client info resolves defaults when fields are missing', () => {
+  const getClientInfo = createGetJellyfinClientInfoHandler({
+    getResolvedJellyfinConfig: () => ({ clientName: '', clientVersion: '', deviceId: '' } as never),
+    getDefaultJellyfinConfig: () =>
+      ({
+        clientName: 'SubMiner',
+        clientVersion: '1.0.0',
+        deviceId: 'default-device',
+      }) as never,
+  });
+
+  assert.deepEqual(getClientInfo(), {
+    clientName: 'SubMiner',
+    clientVersion: '1.0.0',
+    deviceId: 'default-device',
+  });
+});
+
+test('jellyfin client info keeps explicit config values', () => {
+  const getClientInfo = createGetJellyfinClientInfoHandler({
+    getResolvedJellyfinConfig: () =>
+      ({
+        clientName: 'Custom',
+        clientVersion: '2.3.4',
+        deviceId: 'custom-device',
+      }) as never,
+    getDefaultJellyfinConfig: () =>
+      ({
+        clientName: 'SubMiner',
+        clientVersion: '1.0.0',
+        deviceId: 'default-device',
+      }) as never,
+  });
+
+  assert.deepEqual(getClientInfo(), {
+    clientName: 'Custom',
+    clientVersion: '2.3.4',
+    deviceId: 'custom-device',
+  });
+});

src/main/runtime/jellyfin-client-info.ts

@@ -0,0 +1,33 @@
+export function createGetResolvedJellyfinConfigHandler(deps: {
+  getResolvedConfig: () => { jellyfin: unknown };
+}) {
+  return () => deps.getResolvedConfig().jellyfin as never;
+}
+
+export function createGetJellyfinClientInfoHandler(deps: {
+  getResolvedJellyfinConfig: () => {
+    clientName?: string;
+    clientVersion?: string;
+    deviceId?: string;
+  };
+  getDefaultJellyfinConfig: () => {
+    clientName?: string;
+    clientVersion?: string;
+    deviceId?: string;
+  };
+}) {
+  return (
+    config = deps.getResolvedJellyfinConfig(),
+  ): {
+    clientName: string;
+    clientVersion: string;
+    deviceId: string;
+  } => {
+    const defaults = deps.getDefaultJellyfinConfig();
+    return {
+      clientName: config.clientName || defaults.clientName || '',
+      clientVersion: config.clientVersion || defaults.clientVersion || '',
+      deviceId: config.deviceId || defaults.deviceId || '',
+    };
+  };
+}

src/main/runtime/mpv-jellyfin-defaults.test.ts

@@ -0,0 +1,32 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createApplyJellyfinMpvDefaultsHandler,
+  createGetDefaultSocketPathHandler,
+} from './mpv-jellyfin-defaults';
+
+test('apply jellyfin mpv defaults sends expected property commands', () => {
+  const calls: string[] = [];
+  const applyDefaults = createApplyJellyfinMpvDefaultsHandler({
+    sendMpvCommandRuntime: (_client, command) => calls.push(command.join(':')),
+    jellyfinLangPref: 'ja,jp',
+  });
+
+  applyDefaults({});
+  assert.deepEqual(calls, [
+    'set_property:sub-auto:fuzzy',
+    'set_property:aid:auto',
+    'set_property:sid:auto',
+    'set_property:secondary-sid:auto',
+    'set_property:secondary-sub-visibility:no',
+    'set_property:alang:ja,jp',
+    'set_property:slang:ja,jp',
+  ]);
+});
+
+test('get default socket path returns platform specific value', () => {
+  const getWindowsPath = createGetDefaultSocketPathHandler({ platform: 'win32' });
+  const getUnixPath = createGetDefaultSocketPathHandler({ platform: 'darwin' });
+  assert.equal(getWindowsPath(), '\\\\.\\pipe\\subminer-socket');
+  assert.equal(getUnixPath(), '/tmp/subminer-socket');
+});

src/main/runtime/mpv-jellyfin-defaults.ts

@@ -0,0 +1,30 @@
+type MpvClientLike = unknown;
+
+export function createApplyJellyfinMpvDefaultsHandler(deps: {
+  sendMpvCommandRuntime: (
+    client: MpvClientLike,
+    command: [string, string, string],
+  ) => void;
+  jellyfinLangPref: string;
+}) {
+  return (client: MpvClientLike): void => {
+    deps.sendMpvCommandRuntime(client, ['set_property', 'sub-auto', 'fuzzy']);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'aid', 'auto']);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'sid', 'auto']);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'secondary-sid', 'auto']);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'secondary-sub-visibility', 'no']);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'alang', deps.jellyfinLangPref]);
+    deps.sendMpvCommandRuntime(client, ['set_property', 'slang', deps.jellyfinLangPref]);
+  };
+}
+
+export function createGetDefaultSocketPathHandler(deps: {
+  platform: string;
+}) {
+  return (): string => {
+    if (deps.platform === 'win32') {
+      return '\\\\.\\pipe\\subminer-socket';
+    }
+    return '/tmp/subminer-socket';
+  };
+}

src/main/runtime/overlay-runtime-main-actions.test.ts

@@ -0,0 +1,134 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createBroadcastRuntimeOptionsChangedHandler,
+  createGetRuntimeOptionsStateHandler,
+  createOpenRuntimeOptionsPaletteHandler,
+  createRestorePreviousSecondarySubVisibilityHandler,
+  createSendToActiveOverlayWindowHandler,
+  createSetOverlayDebugVisualizationEnabledHandler,
+} from './overlay-runtime-main-actions';
+
+test('runtime options state handler returns empty list without manager', () => {
+  const getState = createGetRuntimeOptionsStateHandler({
+    getRuntimeOptionsManager: () => null,
+  });
+  assert.deepEqual(getState(), []);
+});
+
+test('runtime options state handler returns list from manager', () => {
+  const getState = createGetRuntimeOptionsStateHandler({
+    getRuntimeOptionsManager: () =>
+      ({
+        listOptions: () => [
+          {
+            id: 'anki.autoUpdateNewCards',
+            label: 'X',
+            scope: 'ankiConnect',
+            valueType: 'boolean',
+            value: true,
+            allowedValues: [true, false],
+            requiresRestart: false,
+          },
+        ],
+      }) as never,
+  });
+  assert.deepEqual(getState(), [
+    {
+      id: 'anki.autoUpdateNewCards',
+      label: 'X',
+      scope: 'ankiConnect',
+      valueType: 'boolean',
+      value: true,
+      allowedValues: [true, false],
+      requiresRestart: false,
+    },
+  ]);
+});
+
+test('restore previous secondary subtitle visibility no-ops without connected mpv client', () => {
+  let restored = false;
+  const restore = createRestorePreviousSecondarySubVisibilityHandler({
+    getMpvClient: () => ({ connected: false, restorePreviousSecondarySubVisibility: () => (restored = true) }),
+  });
+  restore();
+  assert.equal(restored, false);
+});
+
+test('restore previous secondary subtitle visibility calls runtime when connected', () => {
+  let restored = false;
+  const restore = createRestorePreviousSecondarySubVisibilityHandler({
+    getMpvClient: () => ({ connected: true, restorePreviousSecondarySubVisibility: () => (restored = true) }),
+  });
+  restore();
+  assert.equal(restored, true);
+});
+
+test('broadcast runtime options changed passes through state getter and broadcaster', () => {
+  const calls: string[] = [];
+  const broadcast = createBroadcastRuntimeOptionsChangedHandler({
+    broadcastRuntimeOptionsChangedRuntime: (getState, emit) => {
+      calls.push(`state:${JSON.stringify(getState())}`);
+      emit('runtime-options:changed', { id: 1 });
+    },
+    getRuntimeOptionsState: () => [
+      {
+        id: 'anki.autoUpdateNewCards',
+        label: 'X',
+        scope: 'ankiConnect',
+        valueType: 'boolean',
+        value: true,
+        allowedValues: [true, false],
+        requiresRestart: false,
+      },
+    ],
+    broadcastToOverlayWindows: (channel, payload) => calls.push(`emit:${channel}:${JSON.stringify(payload)}`),
+  });
+
+  broadcast();
+  assert.deepEqual(calls, [
+    'state:[{"id":"anki.autoUpdateNewCards","label":"X","scope":"ankiConnect","valueType":"boolean","value":true,"allowedValues":[true,false],"requiresRestart":false}]',
+    'emit:runtime-options:changed:{"id":1}',
+  ]);
+});
+
+test('send to active overlay window delegates to runtime sender', () => {
+  const send = createSendToActiveOverlayWindowHandler({
+    sendToActiveOverlayWindowRuntime: (channel, payload) => channel === 'ok' && payload === 1,
+  });
+  assert.equal(send('ok', 1), true);
+  assert.equal(send('no', 1), false);
+});
+
+test('set overlay debug visualization enabled delegates with current state and broadcast', () => {
+  const calls: string[] = [];
+  let current = false;
+  const setEnabled = createSetOverlayDebugVisualizationEnabledHandler({
+    setOverlayDebugVisualizationEnabledRuntime: (curr, next, setCurrent, broadcast) => {
+      calls.push(`runtime:${curr}->${next}`);
+      setCurrent(next);
+      broadcast('overlay-debug:set', next);
+    },
+    getCurrentEnabled: () => current,
+    setCurrentEnabled: (enabled) => {
+      current = enabled;
+      calls.push(`set:${enabled}`);
+    },
+    broadcastToOverlayWindows: (channel, value) => calls.push(`emit:${channel}:${value}`),
+  });
+
+  setEnabled(true);
+  assert.equal(current, true);
+  assert.deepEqual(calls, ['runtime:false->true', 'set:true', 'emit:overlay-debug:set:true']);
+});
+
+test('open runtime options palette handler delegates to runtime', () => {
+  let opened = false;
+  const open = createOpenRuntimeOptionsPaletteHandler({
+    openRuntimeOptionsPaletteRuntime: () => {
+      opened = true;
+    },
+  });
+  open();
+  assert.equal(opened, true);
+});

src/main/runtime/overlay-runtime-main-actions.ts

@@ -0,0 +1,90 @@
+import type { RuntimeOptionState } from '../../types';
+import type { OverlayHostedModal } from '../overlay-runtime';
+
+type RuntimeOptionsManagerLike = {
+  listOptions: () => RuntimeOptionState[];
+};
+
+type MpvClientLike = {
+  connected: boolean;
+  restorePreviousSecondarySubVisibility: () => void;
+};
+
+export function createGetRuntimeOptionsStateHandler(deps: {
+  getRuntimeOptionsManager: () => RuntimeOptionsManagerLike | null;
+}) {
+  return (): RuntimeOptionState[] => {
+    const manager = deps.getRuntimeOptionsManager();
+    if (!manager) return [];
+    return manager.listOptions();
+  };
+}
+
+export function createRestorePreviousSecondarySubVisibilityHandler(deps: {
+  getMpvClient: () => MpvClientLike | null;
+}) {
+  return (): void => {
+    const client = deps.getMpvClient();
+    if (!client || !client.connected) return;
+    client.restorePreviousSecondarySubVisibility();
+  };
+}
+
+export function createBroadcastRuntimeOptionsChangedHandler(deps: {
+  broadcastRuntimeOptionsChangedRuntime: (
+    getRuntimeOptionsState: () => RuntimeOptionState[],
+    broadcastToOverlayWindows: (channel: string, ...args: unknown[]) => void,
+  ) => void;
+  getRuntimeOptionsState: () => RuntimeOptionState[];
+  broadcastToOverlayWindows: (channel: string, ...args: unknown[]) => void;
+}) {
+  return (): void => {
+    deps.broadcastRuntimeOptionsChangedRuntime(
+      () => deps.getRuntimeOptionsState(),
+      (channel, ...args) => deps.broadcastToOverlayWindows(channel, ...args),
+    );
+  };
+}
+
+export function createSendToActiveOverlayWindowHandler(deps: {
+  sendToActiveOverlayWindowRuntime: (
+    channel: string,
+    payload?: unknown,
+    runtimeOptions?: { restoreOnModalClose?: OverlayHostedModal },
+  ) => boolean;
+}) {
+  return (
+    channel: string,
+    payload?: unknown,
+    runtimeOptions?: { restoreOnModalClose?: OverlayHostedModal },
+  ): boolean => deps.sendToActiveOverlayWindowRuntime(channel, payload, runtimeOptions);
+}
+
+export function createSetOverlayDebugVisualizationEnabledHandler(deps: {
+  setOverlayDebugVisualizationEnabledRuntime: (
+    currentEnabled: boolean,
+    nextEnabled: boolean,
+    setCurrentEnabled: (enabled: boolean) => void,
+    broadcastToOverlayWindows: (channel: string, ...args: unknown[]) => void,
+  ) => void;
+  getCurrentEnabled: () => boolean;
+  setCurrentEnabled: (enabled: boolean) => void;
+  broadcastToOverlayWindows: (channel: string, ...args: unknown[]) => void;
+}) {
+  return (enabled: boolean): void => {
+    deps.setOverlayDebugVisualizationEnabledRuntime(
+      deps.getCurrentEnabled(),
+      enabled,
+      (next) => deps.setCurrentEnabled(next),
+      (channel, ...args) => deps.broadcastToOverlayWindows(channel, ...args),
+    );
+  };
+}
+
+export function createOpenRuntimeOptionsPaletteHandler(deps: {
+  openRuntimeOptionsPaletteRuntime: () => void;
+}) {
+  return (): void => {
+    deps.openRuntimeOptionsPaletteRuntime();
+  };
+}

src/main/runtime/secondary-sub-mode-main-deps.test.ts

@@ -0,0 +1,39 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createBuildCycleSecondarySubModeMainDepsHandler } from './secondary-sub-mode-main-deps';
+import type { SecondarySubMode } from '../../types';
+
+test('cycle secondary sub mode main deps builder maps state and broadcasts with channel', () => {
+  const calls: string[] = [];
+  let mode: SecondarySubMode = 'hover';
+  let lastToggleAt = 100;
+  const deps = createBuildCycleSecondarySubModeMainDepsHandler({
+    getSecondarySubMode: () => mode,
+    setSecondarySubMode: (nextMode) => {
+      mode = nextMode;
+      calls.push(`set-mode:${nextMode}`);
+    },
+    getLastSecondarySubToggleAtMs: () => lastToggleAt,
+    setLastSecondarySubToggleAtMs: (timestampMs) => {
+      lastToggleAt = timestampMs;
+      calls.push(`set-ts:${timestampMs}`);
+    },
+    broadcastToOverlayWindows: (channel, nextMode) => calls.push(`broadcast:${channel}:${nextMode}`),
+    showMpvOsd: (text) => calls.push(`osd:${text}`),
+  })();
+
+  assert.equal(deps.getSecondarySubMode(), 'hover');
+  assert.equal(deps.getLastSecondarySubToggleAtMs(), 100);
+  deps.setSecondarySubMode('visible');
+  deps.setLastSecondarySubToggleAtMs(200);
+  deps.broadcastSecondarySubMode('visible');
+  deps.showMpvOsd('Secondary subtitle: visible');
+  assert.equal(mode, 'visible');
+  assert.equal(lastToggleAt, 200);
+  assert.deepEqual(calls, [
+    'set-mode:visible',
+    'set-ts:200',
+    'broadcast:secondary-subtitle:mode:visible',
+    'osd:Secondary subtitle: visible',
+  ]);
+});

src/main/runtime/secondary-sub-mode-main-deps.ts

@@ -0,0 +1,21 @@
+import type { SecondarySubMode } from '../../types';
+
+export function createBuildCycleSecondarySubModeMainDepsHandler(deps: {
+  getSecondarySubMode: () => SecondarySubMode;
+  setSecondarySubMode: (mode: SecondarySubMode) => void;
+  getLastSecondarySubToggleAtMs: () => number;
+  setLastSecondarySubToggleAtMs: (timestampMs: number) => void;
+  broadcastToOverlayWindows: (channel: string, mode: SecondarySubMode) => void;
+  showMpvOsd: (text: string) => void;
+}) {
+  return () => ({
+    getSecondarySubMode: () => deps.getSecondarySubMode(),
+    setSecondarySubMode: (mode: SecondarySubMode) => deps.setSecondarySubMode(mode),
+    getLastSecondarySubToggleAtMs: () => deps.getLastSecondarySubToggleAtMs(),
+    setLastSecondarySubToggleAtMs: (timestampMs: number) =>
+      deps.setLastSecondarySubToggleAtMs(timestampMs),
+    broadcastSecondarySubMode: (mode: SecondarySubMode) =>
+      deps.broadcastToOverlayWindows('secondary-subtitle:mode', mode),
+    showMpvOsd: (text: string) => deps.showMpvOsd(text),
+  });
+}

src/main/runtime/startup-bootstrap-main-deps.test.ts

@@ -0,0 +1,52 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createBuildStartupBootstrapMainDepsHandler } from './startup-bootstrap-main-deps';
+
+test('startup bootstrap main deps builder maps deps and handles generate-config callbacks', () => {
+  const calls: string[] = [];
+  let exitCode = 0;
+  const deps = createBuildStartupBootstrapMainDepsHandler({
+    argv: ['node', 'main.js'],
+    parseArgs: () => ({}) as never,
+    setLogLevel: (level) => calls.push(`log:${level}`),
+    forceX11Backend: () => calls.push('force-x11'),
+    enforceUnsupportedWaylandMode: () => calls.push('guard-wayland'),
+    shouldStartApp: () => true,
+    getDefaultSocketPath: () => '/tmp/mpv.sock',
+    defaultTexthookerPort: 5174,
+    configDir: '/tmp/config',
+    defaultConfig: {} as never,
+    generateConfigTemplate: () => 'template',
+    generateDefaultConfigFile: async () => 0,
+    setExitCode: (code) => {
+      exitCode = code;
+      calls.push(`exit:${code}`);
+    },
+    quitApp: () => calls.push('quit'),
+    logGenerateConfigError: (message) => calls.push(`error:${message}`),
+    startAppLifecycle: () => calls.push('start-lifecycle'),
+  })();
+
+  assert.deepEqual(deps.argv, ['node', 'main.js']);
+  assert.equal(deps.getDefaultSocketPath(), '/tmp/mpv.sock');
+  deps.setLogLevel('debug', 'config');
+  deps.forceX11Backend({} as never);
+  deps.enforceUnsupportedWaylandMode({} as never);
+  deps.startAppLifecycle({} as never);
+  deps.onConfigGenerated(7);
+  assert.equal(exitCode, 7);
+  deps.onGenerateConfigError(new Error('boom'));
+  assert.equal(exitCode, 1);
+
+  assert.deepEqual(calls, [
+    'log:debug',
+    'force-x11',
+    'guard-wayland',
+    'start-lifecycle',
+    'exit:7',
+    'quit',
+    'error:Failed to generate config: boom',
+    'exit:1',
+    'quit',
+  ]);
+});

src/main/runtime/startup-bootstrap-main-deps.ts

@@ -0,0 +1,62 @@
+import type { CliArgs } from '../../cli/args';
+import type { LogLevelSource } from '../../logger';
+import type { ResolvedConfig } from '../../types';
+import type { StartupBootstrapRuntimeFactoryDeps } from '../startup';
+
+export function createBuildStartupBootstrapMainDepsHandler(deps: {
+  argv: string[];
+  parseArgs: (argv: string[]) => CliArgs;
+  setLogLevel: (level: string, source: LogLevelSource) => void;
+  forceX11Backend: (args: CliArgs) => void;
+  enforceUnsupportedWaylandMode: (args: CliArgs) => void;
+  shouldStartApp: (args: CliArgs) => boolean;
+  getDefaultSocketPath: () => string;
+  defaultTexthookerPort: number;
+  configDir: string;
+  defaultConfig: ResolvedConfig;
+  generateConfigTemplate: (config: ResolvedConfig) => string;
+  generateDefaultConfigFile: (
+    args: CliArgs,
+    options: {
+      configDir: string;
+      defaultConfig: unknown;
+      generateTemplate: (config: unknown) => string;
+    },
+  ) => Promise<number>;
+  setExitCode: (code: number) => void;
+  quitApp: () => void;
+  logGenerateConfigError: (message: string) => void;
+  startAppLifecycle: (args: CliArgs) => void;
+}) {
+  return (): StartupBootstrapRuntimeFactoryDeps => ({
+    argv: deps.argv,
+    parseArgs: (argv: string[]) => deps.parseArgs(argv),
+    setLogLevel: (level: string, source: LogLevelSource) => deps.setLogLevel(level, source),
+    forceX11Backend: (args: CliArgs) => deps.forceX11Backend(args),
+    enforceUnsupportedWaylandMode: (args: CliArgs) => deps.enforceUnsupportedWaylandMode(args),
+    shouldStartApp: (args: CliArgs) => deps.shouldStartApp(args),
+    getDefaultSocketPath: () => deps.getDefaultSocketPath(),
+    defaultTexthookerPort: deps.defaultTexthookerPort,
+    configDir: deps.configDir,
+    defaultConfig: deps.defaultConfig,
+    generateConfigTemplate: (config: ResolvedConfig) => deps.generateConfigTemplate(config),
+    generateDefaultConfigFile: (
+      args: CliArgs,
+      options: {
+        configDir: string;
+        defaultConfig: unknown;
+        generateTemplate: (config: unknown) => string;
+      },
+    ) => deps.generateDefaultConfigFile(args, options),
+    onConfigGenerated: (exitCode: number) => {
+      deps.setExitCode(exitCode);
+      deps.quitApp();
+    },
+    onGenerateConfigError: (error: Error) => {
+      deps.logGenerateConfigError(`Failed to generate config: ${error.message}`);
+      deps.setExitCode(1);
+      deps.quitApp();
+    },
+    startAppLifecycle: (args: CliArgs) => deps.startAppLifecycle(args),
+  });
+}

src/main/runtime/startup-config-main-deps.test.ts

@@ -0,0 +1,64 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createBuildCriticalConfigErrorMainDepsHandler,
+  createBuildReloadConfigMainDepsHandler,
+} from './startup-config-main-deps';
+
+test('reload config main deps builder maps callbacks and fail handlers', async () => {
+  const calls: string[] = [];
+  const deps = createBuildReloadConfigMainDepsHandler({
+    reloadConfigStrict: () => ({ ok: true }),
+    logInfo: (message) => calls.push(`info:${message}`),
+    logWarning: (message) => calls.push(`warn:${message}`),
+    showDesktopNotification: (title, options) => calls.push(`notify:${title}:${options.body}`),
+    startConfigHotReload: () => calls.push('start-hot-reload'),
+    refreshAnilistClientSecretState: async (options) => {
+      calls.push(`refresh:${options.force}`);
+      return true;
+    },
+    failHandlers: {
+      logError: (details) => calls.push(`error:${details}`),
+      showErrorBox: (title, details) => calls.push(`error-box:${title}:${details}`),
+      quit: () => calls.push('quit'),
+    },
+  })();
+
+  assert.deepEqual(deps.reloadConfigStrict(), { ok: true });
+  deps.logInfo('x');
+  deps.logWarning('y');
+  deps.showDesktopNotification('SubMiner', { body: 'warn' });
+  deps.startConfigHotReload();
+  await deps.refreshAnilistClientSecretState({ force: true });
+  deps.failHandlers.logError('bad');
+  deps.failHandlers.showErrorBox('Oops', 'Details');
+  deps.failHandlers.quit();
+  assert.deepEqual(calls, [
+    'info:x',
+    'warn:y',
+    'notify:SubMiner:warn',
+    'start-hot-reload',
+    'refresh:true',
+    'error:bad',
+    'error-box:Oops:Details',
+    'quit',
+  ]);
+});
+
+test('critical config main deps builder maps config path and fail handlers', () => {
+  const calls: string[] = [];
+  const deps = createBuildCriticalConfigErrorMainDepsHandler({
+    getConfigPath: () => '/tmp/config.jsonc',
+    failHandlers: {
+      logError: (details) => calls.push(`error:${details}`),
+      showErrorBox: (title, details) => calls.push(`error-box:${title}:${details}`),
+      quit: () => calls.push('quit'),
+    },
+  })();
+
+  assert.equal(deps.getConfigPath(), '/tmp/config.jsonc');
+  deps.failHandlers.logError('bad');
+  deps.failHandlers.showErrorBox('Oops', 'Details');
+  deps.failHandlers.quit();
+  assert.deepEqual(calls, ['error:bad', 'error-box:Oops:Details', 'quit']);
+});

src/main/runtime/startup-config-main-deps.ts

@@ -0,0 +1,47 @@
+export function createBuildReloadConfigMainDepsHandler(deps: {
+  reloadConfigStrict: () => unknown;
+  logInfo: (message: string) => void;
+  logWarning: (message: string) => void;
+  showDesktopNotification: (title: string, options: { body: string }) => void;
+  startConfigHotReload: () => void;
+  refreshAnilistClientSecretState: (options: { force: boolean }) => Promise<unknown>;
+  failHandlers: {
+    logError: (details: string) => void;
+    showErrorBox: (title: string, details: string) => void;
+    quit: () => void;
+  };
+}) {
+  return () => ({
+    reloadConfigStrict: () => deps.reloadConfigStrict() as never,
+    logInfo: (message: string) => deps.logInfo(message),
+    logWarning: (message: string) => deps.logWarning(message),
+    showDesktopNotification: (title: string, options: { body: string }) =>
+      deps.showDesktopNotification(title, options),
+    startConfigHotReload: () => deps.startConfigHotReload(),
+    refreshAnilistClientSecretState: (options: { force: boolean }) =>
+      deps.refreshAnilistClientSecretState(options),
+    failHandlers: {
+      logError: (details: string) => deps.failHandlers.logError(details),
+      showErrorBox: (title: string, details: string) => deps.failHandlers.showErrorBox(title, details),
+      quit: () => deps.failHandlers.quit(),
+    },
+  });
+}
+
+export function createBuildCriticalConfigErrorMainDepsHandler(deps: {
+  getConfigPath: () => string;
+  failHandlers: {
+    logError: (details: string) => void;
+    showErrorBox: (title: string, details: string) => void;
+    quit: () => void;
+  };
+}) {
+  return () => ({
+    getConfigPath: () => deps.getConfigPath(),
+    failHandlers: {
+      logError: (details: string) => deps.failHandlers.logError(details),
+      showErrorBox: (title: string, details: string) => deps.failHandlers.showErrorBox(title, details),
+      quit: () => deps.failHandlers.quit(),
+    },
+  });
+}

src/main/runtime/startup-lifecycle-main-deps.test.ts

@@ -0,0 +1,35 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { createBuildAppLifecycleRuntimeRunnerMainDepsHandler } from './startup-lifecycle-main-deps';
+
+test('app lifecycle runtime runner main deps builder maps lifecycle callbacks', async () => {
+  const calls: string[] = [];
+  const deps = createBuildAppLifecycleRuntimeRunnerMainDepsHandler({
+    app: {} as never,
+    platform: 'darwin',
+    shouldStartApp: () => true,
+    parseArgs: () => ({}) as never,
+    handleCliCommand: () => calls.push('handle-cli'),
+    printHelp: () => calls.push('help'),
+    logNoRunningInstance: () => calls.push('no-instance'),
+    onReady: async () => {
+      calls.push('ready');
+    },
+    onWillQuitCleanup: () => calls.push('cleanup'),
+    shouldRestoreWindowsOnActivate: () => true,
+    restoreWindowsOnActivate: () => calls.push('restore'),
+    shouldQuitOnWindowAllClosed: () => false,
+  })();
+
+  assert.equal(deps.platform, 'darwin');
+  assert.equal(deps.shouldStartApp({} as never), true);
+  deps.handleCliCommand({} as never, 'initial');
+  deps.printHelp();
+  deps.logNoRunningInstance();
+  await deps.onReady();
+  deps.onWillQuitCleanup();
+  deps.restoreWindowsOnActivate();
+  assert.equal(deps.shouldRestoreWindowsOnActivate(), true);
+  assert.equal(deps.shouldQuitOnWindowAllClosed(), false);
+  assert.deepEqual(calls, ['handle-cli', 'help', 'no-instance', 'ready', 'cleanup', 'restore']);
+});

src/main/runtime/startup-lifecycle-main-deps.ts

@@ -0,0 +1,20 @@
+import type { AppLifecycleRuntimeRunnerParams } from '../startup-lifecycle';
+
+export function createBuildAppLifecycleRuntimeRunnerMainDepsHandler(
+  deps: AppLifecycleRuntimeRunnerParams,
+) {
+  return (): AppLifecycleRuntimeRunnerParams => ({
+    app: deps.app,
+    platform: deps.platform,
+    shouldStartApp: deps.shouldStartApp,
+    parseArgs: deps.parseArgs,
+    handleCliCommand: deps.handleCliCommand,
+    printHelp: deps.printHelp,
+    logNoRunningInstance: deps.logNoRunningInstance,
+    onReady: deps.onReady,
+    onWillQuitCleanup: deps.onWillQuitCleanup,
+    shouldRestoreWindowsOnActivate: deps.shouldRestoreWindowsOnActivate,
+    restoreWindowsOnActivate: deps.restoreWindowsOnActivate,
+    shouldQuitOnWindowAllClosed: deps.shouldQuitOnWindowAllClosed,
+  });
+}

src/main/runtime/subtitle-tokenization-main-deps.test.ts

@@ -0,0 +1,77 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createBuildTokenizerDepsMainHandler,
+  createCreateMecabTokenizerAndCheckMainHandler,
+  createPrewarmSubtitleDictionariesMainHandler,
+} from './subtitle-tokenization-main-deps';
+
+test('tokenizer deps builder records known-word lookups and maps readers', () => {
+  const calls: string[] = [];
+  const deps = createBuildTokenizerDepsMainHandler({
+    getYomitanExt: () => ({ id: 'ext' }),
+    getYomitanParserWindow: () => ({ id: 'window' }),
+    setYomitanParserWindow: () => calls.push('set-window'),
+    getYomitanParserReadyPromise: () => null,
+    setYomitanParserReadyPromise: () => calls.push('set-ready'),
+    getYomitanParserInitPromise: () => null,
+    setYomitanParserInitPromise: () => calls.push('set-init'),
+    isKnownWord: (text) => text === 'known',
+    recordLookup: (hit) => calls.push(`lookup:${hit}`),
+    getKnownWordMatchMode: () => 'exact',
+    getMinSentenceWordsForNPlusOne: () => 3,
+    getJlptLevel: () => 'N2',
+    getJlptEnabled: () => true,
+    getFrequencyDictionaryEnabled: () => true,
+    getFrequencyRank: () => 5,
+    getYomitanGroupDebugEnabled: () => false,
+    getMecabTokenizer: () => ({ id: 'mecab' }),
+  })();
+
+  assert.equal(deps.isKnownWord('known'), true);
+  assert.equal(deps.isKnownWord('unknown'), false);
+  deps.setYomitanParserWindow({});
+  deps.setYomitanParserReadyPromise(null);
+  deps.setYomitanParserInitPromise(null);
+  assert.equal(deps.getMinSentenceWordsForNPlusOne(), 3);
+  assert.deepEqual(calls, ['lookup:true', 'lookup:false', 'set-window', 'set-ready', 'set-init']);
+});
+
+test('mecab tokenizer check creates tokenizer once and runs availability check', async () => {
+  const calls: string[] = [];
+  type Tokenizer = { id: string };
+  let tokenizer: Tokenizer | null = null;
+  const run = createCreateMecabTokenizerAndCheckMainHandler<Tokenizer>({
+    getMecabTokenizer: () => tokenizer,
+    setMecabTokenizer: (next) => {
+      tokenizer = next;
+      calls.push('set');
+    },
+    createMecabTokenizer: () => {
+      calls.push('create');
+      return { id: 'mecab' };
+    },
+    checkAvailability: async () => {
+      calls.push('check');
+    },
+  });
+
+  await run();
+  await run();
+  assert.deepEqual(calls, ['create', 'set', 'check', 'check']);
+});
+
+test('dictionary prewarm runs both dictionary loaders', async () => {
+  const calls: string[] = [];
+  const prewarm = createPrewarmSubtitleDictionariesMainHandler({
+    ensureJlptDictionaryLookup: async () => {
+      calls.push('jlpt');
+    },
+    ensureFrequencyDictionaryLookup: async () => {
+      calls.push('freq');
+    },
+  });
+
+  await prewarm();
+  assert.deepEqual(calls.sort(), ['freq', 'jlpt']);
+});

src/main/runtime/subtitle-tokenization-main-deps.ts

@@ -0,0 +1,69 @@
+export function createBuildTokenizerDepsMainHandler(deps: {
+  getYomitanExt: () => unknown;
+  getYomitanParserWindow: () => unknown;
+  setYomitanParserWindow: (window: unknown) => void;
+  getYomitanParserReadyPromise: () => Promise<void> | null;
+  setYomitanParserReadyPromise: (promise: Promise<void> | null) => void;
+  getYomitanParserInitPromise: () => Promise<boolean> | null;
+  setYomitanParserInitPromise: (promise: Promise<boolean> | null) => void;
+  isKnownWord: (text: string) => boolean;
+  recordLookup: (hit: boolean) => void;
+  getKnownWordMatchMode: () => unknown;
+  getMinSentenceWordsForNPlusOne: () => number;
+  getJlptLevel: (text: string) => unknown;
+  getJlptEnabled: () => boolean;
+  getFrequencyDictionaryEnabled: () => boolean;
+  getFrequencyRank: (text: string) => unknown;
+  getYomitanGroupDebugEnabled: () => boolean;
+  getMecabTokenizer: () => unknown;
+}) {
+  return () => ({
+    getYomitanExt: () => deps.getYomitanExt() as never,
+    getYomitanParserWindow: () => deps.getYomitanParserWindow() as never,
+    setYomitanParserWindow: (window: unknown) => deps.setYomitanParserWindow(window),
+    getYomitanParserReadyPromise: () => deps.getYomitanParserReadyPromise() as never,
+    setYomitanParserReadyPromise: (promise: Promise<void> | null) =>
+      deps.setYomitanParserReadyPromise(promise),
+    getYomitanParserInitPromise: () => deps.getYomitanParserInitPromise() as never,
+    setYomitanParserInitPromise: (promise: Promise<boolean> | null) =>
+      deps.setYomitanParserInitPromise(promise),
+    isKnownWord: (text: string) => {
+      const hit = deps.isKnownWord(text);
+      deps.recordLookup(hit);
+      return hit;
+    },
+    getKnownWordMatchMode: () => deps.getKnownWordMatchMode() as never,
+    getMinSentenceWordsForNPlusOne: () => deps.getMinSentenceWordsForNPlusOne(),
+    getJlptLevel: (text: string) => deps.getJlptLevel(text) as never,
+    getJlptEnabled: () => deps.getJlptEnabled(),
+    getFrequencyDictionaryEnabled: () => deps.getFrequencyDictionaryEnabled(),
+    getFrequencyRank: (text: string) => deps.getFrequencyRank(text) as never,
+    getYomitanGroupDebugEnabled: () => deps.getYomitanGroupDebugEnabled(),
+    getMecabTokenizer: () => deps.getMecabTokenizer() as never,
+  });
+}
+
+export function createCreateMecabTokenizerAndCheckMainHandler<TMecab>(deps: {
+  getMecabTokenizer: () => TMecab | null;
+  setMecabTokenizer: (tokenizer: TMecab) => void;
+  createMecabTokenizer: () => TMecab;
+  checkAvailability: (tokenizer: TMecab) => Promise<unknown>;
+}) {
+  return async (): Promise<void> => {
+    let tokenizer = deps.getMecabTokenizer();
+    if (!tokenizer) {
+      tokenizer = deps.createMecabTokenizer();
+      deps.setMecabTokenizer(tokenizer);
+    }
+    await deps.checkAvailability(tokenizer);
+  };
+}
+
+export function createPrewarmSubtitleDictionariesMainHandler(deps: {
+  ensureJlptDictionaryLookup: () => Promise<void>;
+  ensureFrequencyDictionaryLookup: () => Promise<void>;
+}) {
+  return async (): Promise<void> => {
+    await Promise.all([deps.ensureJlptDictionaryLookup(), deps.ensureFrequencyDictionaryLookup()]);
+  };
+}