refactor: remove dead code and enable noUnusedLocals (#292)

* refactor: remove dead code and enable noUnusedLocals

- delete launcher/jimaku.ts and the launcher Args/config jimaku* fields
  that only fed it (the SUBMINER_JIMAKU_* env vars had no effect)
- delete plugin/subminer/hover.lua; nothing has sent subminer-hover-token
  since Overlay 2.0
- drop never-read anilist.characterDictionary.refreshTtlHours and
  evictionPolicy (still hidden in the settings UI for old configs)
- drop unused root deps: eslint, @fontsource-variable/geist{,-mono}
  (stats/ declares its own)
- delete the committed draft renderer-performance plan doc
- turn on noUnusedLocals for typecheck and remove what it surfaced,
  including Windows focus-handoff values computed but never consumed

* docs(changes): add docs fragment and note retired hover messages

src/main/character-dictionary-runtime.ts

@@ -49,7 +49,6 @@ import type {
   CharacterDictionaryRuntimeDeps,
   CharacterDictionarySnapshot,
   CharacterDictionarySnapshotImage,
-  CharacterDictionarySnapshotProgress,
   CharacterDictionarySnapshotProgressCallbacks,
   CharacterDictionarySnapshotResult,
   MergedCharacterDictionaryBuildResult,

src/main/overlay-visibility-runtime.ts

@@ -15,9 +15,6 @@ export interface OverlayVisibilityRuntimeDeps {
   getSuspendVisibleOverlay?: () => boolean;
   getOverlayInteractionActive?: () => boolean;
   getWindowTracker: () => BaseWindowTracker | null;
-  getLastKnownWindowsForegroundProcessName?: () => string | null;
-  getWindowsOverlayProcessName?: () => string | null;
-  getWindowsFocusHandoffGraceActive?: () => boolean;
   getMacOSForegroundProbeActive?: () => boolean;
   getTrackerNotReadyWarningShown: () => boolean;
   setTrackerNotReadyWarningShown: (shown: boolean) => void;
@@ -61,9 +58,6 @@ export function createOverlayVisibilityRuntimeService(
         overlayInteractionActive: deps.getOverlayInteractionActive?.() ?? false,
         mainWindow,
         windowTracker,
-        lastKnownWindowsForegroundProcessName: deps.getLastKnownWindowsForegroundProcessName?.(),
-        windowsOverlayProcessName: deps.getWindowsOverlayProcessName?.() ?? null,
-        windowsFocusHandoffGraceActive: deps.getWindowsFocusHandoffGraceActive?.() ?? false,
         macOSForegroundProbeActive: deps.getMacOSForegroundProbeActive?.() ?? false,
         trackerNotReadyWarningShown: deps.getTrackerNotReadyWarningShown(),
         setTrackerNotReadyWarningShown: (shown: boolean) => {

src/main/runtime/overlay-visibility-runtime-main-deps.ts

@@ -14,10 +14,6 @@ export function createBuildOverlayVisibilityRuntimeMainDepsHandler(
     getSuspendVisibleOverlay: () => deps.getSuspendVisibleOverlay?.() ?? false,
     getOverlayInteractionActive: () => deps.getOverlayInteractionActive?.() ?? false,
     getWindowTracker: () => deps.getWindowTracker(),
-    getLastKnownWindowsForegroundProcessName: () =>
-      deps.getLastKnownWindowsForegroundProcessName?.() ?? null,
-    getWindowsOverlayProcessName: () => deps.getWindowsOverlayProcessName?.() ?? null,
-    getWindowsFocusHandoffGraceActive: () => deps.getWindowsFocusHandoffGraceActive?.() ?? false,
     getMacOSForegroundProbeActive: () => deps.getMacOSForegroundProbeActive?.() ?? false,
     getTrackerNotReadyWarningShown: () => deps.getTrackerNotReadyWarningShown(),
     setTrackerNotReadyWarningShown: (shown: boolean) => deps.setTrackerNotReadyWarningShown(shown),

src/main/runtime/visible-overlay-interaction-runtime.ts

@@ -78,7 +78,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
   const VISIBLE_OVERLAY_BLUR_REFRESH_DELAYS_MS = [0, 25, 100, 250] as const;
   const WINDOWS_VISIBLE_OVERLAY_Z_ORDER_RETRY_DELAYS_MS = [0, 48, 120, 240, 480] as const;
   const WINDOWS_VISIBLE_OVERLAY_FOREGROUND_POLL_INTERVAL_MS = 75;
-  const WINDOWS_VISIBLE_OVERLAY_FOCUS_HANDOFF_GRACE_MS = 200;
   const LINUX_VISIBLE_OVERLAY_FOCUS_HANDOFF_GRACE_MS = 1_500;
   // Ignore transient "neither mpv nor overlay is the active window" blips before suppressing
   // subtitle pointer interaction. Right after playback starts the overlay can briefly become the
@@ -93,7 +92,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
   let windowsVisibleOverlayForegroundPollInterval: ReturnType<typeof setInterval> | null = null;
   let windowsOverlayPointerInteractionActive = false;
   let lastWindowsVisibleOverlayForegroundProcessName: string | null = null;
-  let lastWindowsVisibleOverlayBlurredAtMs = 0;
   let lastLinuxVisibleOverlayFollowedMpvAtMs = 0;
   const linuxPointerForegroundSuppressionGrace: ForegroundSuppressionGraceState = {
     lossSinceMs: null,
@@ -482,15 +480,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
     }
   }
 
-  function hasWindowsVisibleOverlayFocusHandoffGrace(): boolean {
-    return (
-      process.platform === 'win32' &&
-      lastWindowsVisibleOverlayBlurredAtMs > 0 &&
-      Date.now() - lastWindowsVisibleOverlayBlurredAtMs <=
-        WINDOWS_VISIBLE_OVERLAY_FOCUS_HANDOFF_GRACE_MS
-    );
-  }
-
   function shouldPollWindowsVisibleOverlayForegroundProcess(): boolean {
     if (process.platform !== 'win32' || !overlayManager.getVisibleOverlayVisible()) {
       return false;
@@ -562,9 +551,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
       return;
     }
 
-    if (process.platform === 'win32') {
-      lastWindowsVisibleOverlayBlurredAtMs = Date.now();
-    }
     startMacOSVisibleOverlayForegroundProbe();
     clearVisibleOverlayBlurRefreshTimeouts();
     for (const delayMs of VISIBLE_OVERLAY_BLUR_REFRESH_DELAYS_MS) {
@@ -860,7 +846,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
     retargetOverlayWindowTrackerForMpvSocket,
     requestWindowsVisibleOverlayZOrderSync,
     scheduleWindowsVisibleOverlayZOrderSyncBurst,
-    hasWindowsVisibleOverlayFocusHandoffGrace,
     ensureWindowsVisibleOverlayForegroundPollLoop,
     clearWindowsVisibleOverlayForegroundPollLoop,
     scheduleVisibleOverlayBlurRefresh,
@@ -881,8 +866,6 @@ export function createVisibleOverlayInteractionRuntime(deps: VisibleOverlayInter
       windowsOverlayPointerInteractionActive = false;
     },
     getLinuxOverlayInputShapeActive: () => linuxOverlayInputShapeActive,
-    getLastWindowsVisibleOverlayForegroundProcessName: () =>
-      lastWindowsVisibleOverlayForegroundProcessName,
     getMacOSVisibleOverlayForegroundProbeActive: () => macOSVisibleOverlayForegroundProbeActive,
     setLinuxOverlayInteractiveHint: (interactive: boolean) => {
       linuxOverlayInteractiveHint = interactive;