fix: resolve admin white screen via static ChatWindowProvider import

- Statically declare ChatWindowProvider in payload.config.ts admin.components.providers
- Regenerate importMap.js with correct component mappings
- Update Dockerfile to support _at-mintel monorepo sync for local builds
- Add .gitignore entries for manual build artifacts
- Update blocks and collections (payload-ai integration updates)
- Sync pnpm-lock.yaml

apps/web/package.json

@@ -41,7 +41,7 @@
     "@mintel/content-engine": "link:../../../at-mintel/packages/content-engine",
     "@mintel/estimation-engine": "link:../../../at-mintel/packages/estimation-engine",
     "@mintel/meme-generator": "link:../../../at-mintel/packages/meme-generator",
-    "@mintel/payload-ai": "^1.9.15",
+    "@mintel/payload-ai": "link:../../../at-mintel/packages/payload-ai",
     "@mintel/pdf": "link:../../../at-mintel/packages/pdf-library",
     "@mintel/thumbnail-generator": "link:../../../at-mintel/packages/thumbnail-generator",
     "@next/mdx": "^16.1.6",