feat(notifications): add notification history panel and overlay UX fixes

- New toggleNotificationHistory (Ctrl+N) session-scoped history panel; slides in from same edge as notification stack
- Overlay error/recovery toast follows notifications.overlayPosition; stack and history side seeded at startup
- Cold managed background startup initializes tray and visible overlay shell before tokenization warmups finish
- Add Update button to overlay update-available notifications
- Fix Ctrl+S sentence-card flow: only Anki progress notification, no duplicate status toast
- Fix overlay notification close/actions clickability above subtitle bars on Linux
- Increase pause-until-ready default timeout from 15s to 30s

src/shared/ipc/contracts.ts

@@ -62,6 +62,7 @@ export const IPC_CHANNELS = {
     getConfigShortcuts: 'get-config-shortcuts',
     getStatsToggleKey: 'get-stats-toggle-key',
     getMarkWatchedKey: 'get-mark-watched-key',
+    getOverlayNotificationPosition: 'get-overlay-notification-position',
     getControllerConfig: 'get-controller-config',
     getSecondarySubMode: 'get-secondary-sub-mode',
     getCurrentSecondarySub: 'get-current-secondary-sub',
@@ -146,6 +147,7 @@ export const IPC_CHANNELS = {
     primarySubtitleBarToggle: 'primary-subtitle-bar:toggle',
     configHotReload: 'config:hot-reload',
     overlayNotification: 'overlay:notification',
+    notificationHistoryToggle: 'notification-history:toggle',
   },
 } as const;
 

src/shared/ipc/validators.test.ts

@@ -0,0 +1,44 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { DEFAULT_CONFIG, DEFAULT_KEYBINDINGS } from '../../config/definitions';
+import { compileSessionBindings } from '../../core/services/session-bindings';
+import { resolveConfiguredShortcuts } from '../../core/utils/shortcut-config';
+import { parseSessionActionDispatchRequest } from './validators';
+
+// Regression guard: SESSION_ACTION_IDS in validators.ts is a hand-maintained mirror of the
+// SessionActionId union. If a new shortcut-backed action is added to the union/defaults but not to
+// the validator allow-list, the renderer's dispatchSessionAction IPC is rejected at runtime (which
+// surfaces as a "Renderer error recovered" toast). Compile every default binding and assert the
+// validator accepts each one so the two lists can't silently drift apart.
+test('every default session-action binding is accepted by parseSessionActionDispatchRequest', () => {
+  const { bindings } = compileSessionBindings({
+    shortcuts: resolveConfiguredShortcuts(DEFAULT_CONFIG, DEFAULT_CONFIG),
+    keybindings: DEFAULT_KEYBINDINGS,
+    statsToggleKey: DEFAULT_CONFIG.stats.toggleKey,
+    statsMarkWatchedKey: DEFAULT_CONFIG.stats.markWatchedKey,
+    platform: 'linux',
+    rawConfig: DEFAULT_CONFIG,
+  });
+
+  const sessionActions = bindings.filter((binding) => binding.actionType === 'session-action');
+  assert.ok(sessionActions.length > 0, 'expected default session-action bindings to exist');
+
+  for (const binding of sessionActions) {
+    if (binding.actionType !== 'session-action') continue;
+    const request =
+      binding.payload === undefined
+        ? { actionId: binding.actionId }
+        : { actionId: binding.actionId, payload: binding.payload };
+    assert.ok(
+      parseSessionActionDispatchRequest(request) !== null,
+      `validator rejected session action: ${binding.actionId}`,
+    );
+  }
+});
+
+test('toggleNotificationHistory dispatch request is accepted', () => {
+  assert.deepEqual(parseSessionActionDispatchRequest({ actionId: 'toggleNotificationHistory' }), {
+    actionId: 'toggleNotificationHistory',
+  });
+});

src/shared/ipc/validators.ts

@@ -20,6 +20,7 @@ const RESERVED_CONTROLLER_PROFILE_IDS = new Set(['__proto__', 'constructor', 'pr
 
 const SESSION_ACTION_IDS: SessionActionId[] = [
   'toggleStatsOverlay',
+  'markWatched',
   'toggleVisibleOverlay',
   'copySubtitle',
   'copySubtitleMultiple',
@@ -31,6 +32,7 @@ const SESSION_ACTION_IDS: SessionActionId[] = [
   'toggleSecondarySub',
   'markAudioCard',
   'toggleSubtitleSidebar',
+  'toggleNotificationHistory',
   'openRuntimeOptions',
   'openSessionHelp',
   'openCharacterDictionaryManager',

src/shared/subminer-plugin-script-opts.ts

@@ -14,6 +14,8 @@ export interface SubminerPluginRuntimeScriptOptConfig {
   texthookerEnabled: boolean;
 }
 
+const AUTO_START_PAUSE_UNTIL_READY_TIMEOUT_SECONDS = 30;
+
 function boolScriptOpt(value: boolean): 'yes' | 'no' {
   return value ? 'yes' : 'no';
 }
@@ -42,6 +44,7 @@ export function buildSubminerPluginRuntimeScriptOptParts(
     `subminer-auto_start_pause_until_ready=${boolScriptOpt(
       runtimeConfig.autoStartPauseUntilReady,
     )}`,
+    `subminer-auto_start_pause_until_ready_timeout_seconds=${AUTO_START_PAUSE_UNTIL_READY_TIMEOUT_SECONDS}`,
     `subminer-osd_messages=${boolScriptOpt(runtimeConfig.osdMessages)}`,
     `subminer-texthooker_enabled=${boolScriptOpt(runtimeConfig.texthookerEnabled)}`,
   ];