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/player/Queue.svelte

@@ -6,6 +6,9 @@
   import { auth } from "$lib/stores/auth";
   import { queue } from "$lib/stores/queue";
   import CachedImage from "../common/CachedImage.svelte";
+  import { createLogger } from "$lib/utils/logger";
+
+  const log = createLogger("QueueView");
 
   interface Props {
     items: MediaItem[];
@@ -82,7 +85,7 @@
         // Sync with backend
         await playerController.moveInQueue(fromIndex, toIndex);
       } catch (e) {
-        console.error("Failed to move queue item:", e);
+        log.error("Failed to move queue item:", e);
         // The store already updated optimistically, refresh if needed
       }
     }
@@ -109,7 +112,7 @@
       queue.removeFromQueue(index);
       await playerController.removeFromQueue(index);
     } catch (err) {
-      console.error("Failed to remove from queue:", err);
+      log.error("Failed to remove from queue:", err);
     }
   }
 </script>