FEA-1550: Add SQLite to PGlite migration

- Add a recoverable SQLite to PGlite migration layer for agent dashboard data

- Copy supported tables with row-count verification and .bak retention handling

- Cover successful migration, fallback, skip, and backup cleanup paths

Testing: Full desktop test suite, typecheck, lint, and focused migration tests passed

Risks: Runtime cutover to PGlite remains gated on the shared PGlite engine/schema prerequisite

Author: mikeangstadt

apps/desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "desktop",
-  "version": "0.15.113",
+  "version": "0.15.114",
   "description": "ClosedLoop Desktop",
   "author": "ClosedLoop AI <support@closedloop.ai>",
   "private": true,
@@ -45,6 +45,7 @@
   "dependencies": {
     "@closedloop-ai/design-system": "0.1.1-dev.26892521643.1",
     "@closedloop-ai/loops-api": ">=0.3.1",
+    "@electric-sql/pglite": "^0.4.6",
     "@pydantic/genai-prices": "0.0.62",
     "agent-dashboard": "github:hoangsonww/Claude-Code-Agent-Monitor#840c518d7fa69231de049e41b893938228b67e40",
     "busboy": "^1.6.0",