Add IMDb movie importer feature and unify header

Introduces a new movie importer feature allowing admins to search and import movies from IMDb, including new components for search, result display, and error handling. Replaces the schedule header with a reusable menu header component. Updates routing, navigation, and HTTP service to support the new importer. Adds a poster placeholder image and improves poster error handling.

package.json

@@ -30,7 +30,7 @@
     "@angular/material": "^20.2.9",
     "@angular/platform-browser": "^20.3.0",
     "@angular/router": "^20.3.0",
-    "@infinimotion/model-frontend": "^0.0.84",
+    "@infinimotion/model-frontend": "^0.0.85",
     "@tailwindcss/postcss": "^4.1.14",
     "postcss": "^8.5.6",
     "rxjs": "~7.8.0",