feat(subtitles): add local Japanese subtitle generation

- Generate Japanese SRTs through the overlay modal or launcher
- Support managed whisper.cpp models and optional dialogue detection

launcher/main.ts

@@ -25,6 +25,7 @@ import { runHistorySession } from './commands/history-command.js';
 import { runSyncCommand } from './commands/sync-command.js';
 import { runPlaybackCommand } from './commands/playback-command.js';
 import { runUpdateCommand } from './commands/update-command.js';
+import { runGenerateSubtitlesCommand } from './commands/generate-subtitles-command.js';
 
 const APP_VERSION =
   typeof packageJson.version === 'string' && packageJson.version.trim()
@@ -112,6 +113,10 @@ async function main(): Promise<void> {
     return;
   }
 
+  if (await runGenerateSubtitlesCommand(context)) {
+    return;
+  }
+
   const resolvedAppPath = ensureAppPath(context);
   state.appPath = resolvedAppPath;
   log('debug', args.logLevel, `Using SubMiner app binary: ${resolvedAppPath}`);