refactor(logging): route frontend console calls through the logger

TRACES: | DR-204

484 ungated `console.*` calls across 63 non-test frontend files shipped to
end users with no way to turn them off. Mechanical substitution, no control
flow, error handling or message semantics changed:

  console.log / console.debug -> log.debug
  console.info                -> log.info
  console.warn                -> log.warn
  console.error               -> log.error

Hand-written `"[Scope] …"` prefixes are dropped where the logger's scope
now carries them; scope names that already existed are preserved verbatim
(`[Auth]`, `[VideoPlayer]`, `[PiP]`, …) and inferred from the filename
where a file had none. `src/routes/player/[id]/+page.svelte` keeps its
`NextEpisode` and `AutoPlay` sub-scopes as separate loggers rather than
flattening them into the page scope.

`grep -rn 'console\.' src/` now matches nothing outside the tests and the
facade itself.

src/lib/components/library/ArtistDetailView.svelte

@@ -8,6 +8,9 @@
   import CachedImage from "$lib/components/common/CachedImage.svelte";
   import FavoriteButton from "$lib/components/FavoriteButton.svelte";
   import { favoriteOverrides, resolveIsFavorite } from "$lib/stores/favorites";
+  import { createLogger } from "$lib/utils/logger";
+
+  const log = createLogger("ArtistDetailView");
 
   interface Props {
     artist: MediaItem;
@@ -47,7 +50,7 @@
         });
         albums = albumsResult.items.filter(item => item.kind === "album");
       } catch (e) {
-        console.warn("Failed to load albums:", e);
+        log.warn("Failed to load albums:", e);
       } finally {
         albumsLoading = false;
       }
@@ -62,7 +65,7 @@
         });
         topTracks = tracksResult.items.filter(item => item.kind === "track");
       } catch (e) {
-        console.warn("Failed to load tracks:", e);
+        log.warn("Failed to load tracks:", e);
       } finally {
         tracksLoading = false;
       }
@@ -82,14 +85,14 @@
             .slice(0, 6);
         }
       } catch (e) {
-        console.warn("Failed to load related artists:", e);
+        log.warn("Failed to load related artists:", e);
       } finally {
         artistsLoading = false;
       }
 
       singlesLoading = false;
     } catch (e) {
-      console.error("Error loading artist content:", e);
+      log.error("Error loading artist content:", e);
     }
   }
 </script>