Fix DLC switch freeze: skip bulk cover scraping for themes/DLC

app/covers.py

@@ -411,6 +411,9 @@ def _fetch_libretro(name, timeout, system="games", indexed_only=False):
         data = fetch_libretro_local(name)
         if data is not None:
             return data
+    # Theme/DLC share the PSP thumbnails repo, so reuse the games index instead
+    # of downloading a duplicate copy of the same tree under a new system key.
+    idx_system = system if system in _PLATFORMS else "games"
     if not indexed_only:
         # 1. Cheap: exact + progressively stripped names (no index needed).
         for kind in _LIBRETRO_KINDS:
@@ -421,7 +424,7 @@ def _fetch_libretro(name, timeout, system="games", indexed_only=False):
     # 2. Fuzzy/exact via the precomputed index (covers exact names too, so the
     #    bulk loader skips the wasteful exact pass entirely).
     for kind in _LIBRETRO_KINDS:
-        best = _index_best(name, kind, system)
+        best = _index_best(name, kind, idx_system)
         if best:
             data = _fetch_png(best, kind, timeout, system)
             if data is not None: