fix: address PR #1641 review comments (round 2)

- Remove duplicate TranscriptWatcher/config imports in worker-service.ts
- Use normalizePlatformSource in handleSessionInitByClaudeId for consistency
- Don't skip DB completion when session not in memory (completeByClaudeId)
- Add try-catch around fetch in useContextPreview refresh callback
- Deduplicate store.getAllProjects() call in DataRoutes
- Fix malformed comment separators in migration runner
- Fix missing closing brace and JSDoc opener (merge artifact) in migration runner

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/worker/http/routes/DataRoutes.ts

@@ -284,10 +284,11 @@ export class DataRoutes extends BaseRouteHandler {
     const platformSource = req.query.platformSource as string | undefined;
 
     if (platformSource) {
+      const projects = store.getAllProjects(platformSource);
       res.json({
-        projects: store.getAllProjects(platformSource),
+        projects,
         sources: [platformSource],
-        projectsBySource: { [platformSource]: store.getAllProjects(platformSource) }
+        projectsBySource: { [platformSource]: projects }
       });
       return;
     }