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/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)}`,
   ];