Improve handling of previews

AGENT.MD

@@ -190,7 +190,10 @@ Remote image search:
 - `GET /api/artwork/providers` exposes available providers to the UI
 - `GET /api/artwork/search` calls the selected provider
 - `POST /api/artwork/import` downloads, validates, size-limits, and caches a selected remote image
-- The first provider is Wikimedia Commons; add future providers by implementing `ImageSearchProvider` and registering it in `IMAGE_SEARCH_PROVIDERS`
+- Current providers are Wikimedia Commons, optional TMDB, and optional Google Custom Search
+- TMDB is enabled with `TMDB_BEARER_TOKEN` or `TMDB_API_KEY`
+- Google Custom Search is enabled with `GOOGLE_CUSTOM_SEARCH_API_KEY` and `GOOGLE_CUSTOM_SEARCH_ENGINE_ID`
+- Add future providers by implementing `ImageSearchProvider` and registering it in `IMAGE_SEARCH_PROVIDERS`
 
 ## Rendering Pipeline
 

README.md

@@ -68,6 +68,20 @@ A self-hosted web UI that generates landscape thumbnails from your Emby library
 3. Give it a name (e.g. "Thumb Generator")
 4. Copy the key
 
+## Optional Artwork Providers
+
+The artwork editor always supports Emby images and Wikimedia Commons. You can enable additional search providers with environment variables:
+
+```bash
+export TMDB_BEARER_TOKEN=your-tmdb-read-access-token
+# or: export TMDB_API_KEY=your-tmdb-v3-api-key
+
+export GOOGLE_CUSTOM_SEARCH_API_KEY=your-google-api-key
+export GOOGLE_CUSTOM_SEARCH_ENGINE_ID=your-google-search-engine-id
+```
+
+TMDB is the preferred external artwork source for posters and backdrops. Google Custom Search is optional and only uses Google's official Custom Search JSON API.
+
 ## Notes
 
 - First generation will be slower as rembg downloads the U2-Net model (~170MB)

docker-compose.yml

@@ -7,6 +7,11 @@ services:
     environment:
       - EMBY_URL=http://your-emby-server:8096
       - EMBY_API_KEY=your-api-key-here
+      # Optional external artwork providers:
+      # - TMDB_BEARER_TOKEN=your-tmdb-read-access-token
+      # - TMDB_API_KEY=your-tmdb-v3-api-key
+      # - GOOGLE_CUSTOM_SEARCH_API_KEY=your-google-api-key
+      # - GOOGLE_CUSTOM_SEARCH_ENGINE_ID=your-google-search-engine-id
     volumes:
       - ./output:/app/output
       - ./cache:/app/cache

emby-cover.code-workspace

@@ -0,0 +1,7 @@
+{
+	"folders": [
+		{
+			"path": "."
+		}
+	]
+}

templates/airing.html

@@ -387,6 +387,7 @@
   <h1>Emby Thumbnail Generator</h1>
   <nav class="header-nav">
     <a class="nav-link" href="/">Generator</a>
+    <a class="nav-link" href="/collections">Collections</a>
     <a class="nav-link active" href="/airing">Airing</a>
   </nav>
   <div class="header-status">