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/stores/queue.ts

@@ -10,6 +10,9 @@ import { writable, derived, get } from "svelte/store";
 import { commands, events } from "$lib/api/bindings";
 import type { MediaItem } from "$lib/api/types";
 import { auth } from "$lib/stores/auth";
+import { createLogger } from "$lib/utils/logger";
+
+const log = createLogger("Queue");
 
 export type RepeatMode = "off" | "all" | "one";
 
@@ -72,7 +75,7 @@ function createQueueStore() {
   async function syncFromRust(): Promise<void> {
     try {
       const rustQueue = (await commands.playerGetQueue()) as unknown as QueueChangedEvent;
-      console.log("[Queue] Synced from Rust - items:", rustQueue.items.length);
+      log.debug("Synced from Rust - items:", rustQueue.items.length);
       set({
         items: rustQueue.items,
         currentIndex: rustQueue.currentIndex,
@@ -82,7 +85,7 @@ function createQueueStore() {
         hasPrevious: rustQueue.hasPrevious,
       });
     } catch (error) {
-      console.error("[Queue] Failed to sync from Rust:", error);
+      log.error("Failed to sync from Rust:", error);
     }
   }