IGDB auto-enrichment: Server-Start + Frontend auto-trigger

- Server enriched bestehende User beim Plugin-Start automatisch (fire-and-forget)
- Frontend triggert IGDB-Enrichment automatisch beim Öffnen einer User-Bibliothek
- Reduzierte Log-Ausgabe (kein Spam pro Cache-Hit mehr)
- IGDB-Button zeigt Lade-Animation während Enrichment

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

web/src/plugins/game-library/GameLibraryTab.tsx

@@ -145,7 +145,23 @@ export default function GameLibraryTab({ data }: { data: any }) {
       const resp = await fetch(`/api/game-library/user/${steamId}`);
       if (resp.ok) {
         const d = await resp.json();
-        setUserGames(d.games || d);
+        const games: SteamGame[] = d.games || d;
+        setUserGames(games);
+
+        // Auto-enrich with IGDB if many games lack data
+        const unenriched = games.filter(g => !g.igdb).length;
+        if (unenriched > 0) {
+          setEnriching(steamId);
+          fetch(`/api/game-library/igdb/enrich/${steamId}`)
+            .then(r => r.ok ? r.json() : null)
+            .then(() => fetch(`/api/game-library/user/${steamId}`))
+            .then(r => r.ok ? r.json() : null)
+            .then(d2 => {
+              if (d2) setUserGames(d2.games || d2);
+            })
+            .catch(() => {})
+            .finally(() => setEnriching(null));
+        }
       }
     } catch {
       /* silent */
@@ -439,10 +455,10 @@ export default function GameLibraryTab({ data }: { data: any }) {
                     ↻
                   </button>
                   <button
-                    className="gl-enrich-btn"
+                    className={`gl-enrich-btn ${enriching === selectedUser ? 'enriching' : ''}`}
                     onClick={() => enrichUser(selectedUser!)}
                     disabled={enriching === selectedUser}
-                    title="Mit IGDB-Daten anreichern"
+                    title={enriching === selectedUser ? 'IGDB-Daten werden geladen...' : 'Mit IGDB-Daten anreichern (erneut)'}
                   >
                     {enriching === selectedUser ? '\u23F3' : '\uD83C\uDF10'} IGDB
                   </button>