feat: Ford legacy support, EMEX browser pooling, collapsible sidebar

- Add PL24 Ford legacy service for fordt_parts architecture
- Refactor EMEX to use persistent browser pool instead of per-call instances
- Make vehicle decode resilient: fallback to PL24 when Corgi doesn't recognize VIN
- Add collapsible sidebar with persistent user preference
- Improve brand access guard and categories service
- Add debug/test scripts for VIN e2e testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -19,11 +19,10 @@
       "@nestjs/core",
       "esbuild",
       "msgpackr-extract",
-      "puppeteer",
       "sharp"
     ]
   },
   "dependencies": {
-    "puppeteer": "^23.11.1"
+    "playwright": "^1.50.0"
   }
 }