fix: resolve 5 pre-merge issues in finding archive tracking

1. ACTIVE state never populated — stats endpoint now computes ACTIVE from live findings cache count instead of querying archive table

2. CHECK constraint mismatch — migration now uses 3-state constraint (ARCHIVED, RETURNED, CLOSED) matching runtime initArchiveTables()

3. Archive filter click non-functional — handleArchiveStateClick now fetches and renders filtered archive list below summary bar

4. Hook glob pattern mismatch — changed **/migrate*.js to **/migrations/*.js so hook fires for actual migration filenames

5. Stale stats after sync — ArchiveSummaryBar polls every 60s and refreshes immediately after workflow sync via refreshKey prop

.kiro/hooks/verify-new-migration.kiro.hook

@@ -1,12 +1,12 @@
 {
   "enabled": true,
   "name": "Verify New Migration",
-  "description": "On creation of new migration files (migrate*.js), verifies the migration follows existing project patterns: uses CREATE TABLE IF NOT EXISTS, includes explicit column types, adds appropriate indexes, and wraps multiple statements in transactions.",
+  "description": "On creation of new migration files in backend/migrations/, verifies the migration follows existing project patterns: uses CREATE TABLE IF NOT EXISTS, includes explicit column types, adds appropriate indexes, and wraps multiple statements in transactions.",
   "version": "1",
   "when": {
     "type": "fileCreated",
     "patterns": [
-      "**/migrate*.js"
+      "**/migrations/*.js"
     ]
   },
   "then": {