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-service.ts

@@ -131,10 +131,6 @@ import { MemoryRoutes } from './worker/http/routes/MemoryRoutes.js';
 // Process management for zombie cleanup (Issue #737)
 import { startOrphanReaper, reapOrphanedProcesses, getProcessBySession, ensureProcessExit } from './worker/ProcessRegistry.js';
 
-// Transcript watcher for external CLI session monitoring
-import { TranscriptWatcher } from './transcripts/watcher.js';
-import { loadTranscriptWatchConfig, expandHomePath, DEFAULT_CONFIG_PATH as TRANSCRIPT_CONFIG_PATH } from './transcripts/config.js';
-
 /**
  * Build JSON status output for hook framework communication.
  * This is a pure function extracted for testability.