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

.dockerignore

@@ -1,9 +1,13 @@
-node_modules
-.next
-out
-dist
-*.log
-.git
+# Exclude all binary/dependency folders recursively
+**/node_modules
+**/.pnpm-store
+**/.git
+**/.next
+**/dist
+**/out
+**/*.log
+
+# Specific exclusions for this project
 .DS_Store
 cloned-websites
 storage
@@ -11,3 +15,11 @@ storage
 verify_ci
 pnpm_install_log.txt
 full_tree.json
+backups
+data
+
+# Ensure we don't copy the sibling's build artifacts either
+_at-mintel/**/node_modules
+_at-mintel/**/dist
+_at-mintel/**/.next
+_at-mintel/.git