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/services/offlineCatalog.ts

@@ -17,6 +17,9 @@ import { writable, type Writable } from "svelte/store";
 import { commands } from "$lib/api/bindings";
 import { auth } from "$lib/stores/auth";
 import { isConnected } from "$lib/stores/connectivity";
+import { createLogger } from "$lib/utils/logger";
+
+const log = createLogger("OfflineCatalog");
 
 /**
  * When true (and offline), library grids reveal greyed-out versions of media
@@ -58,7 +61,7 @@ async function pushCatalogVisibility(connected: boolean, showCatalog: boolean):
   try {
     await commands.setShowServerCatalog(include);
   } catch (err) {
-    console.warn("[OfflineCatalog] Failed to set catalog visibility:", err);
+    log.warn("Failed to set catalog visibility:", err);
     // The backend is still on the old gate, so forget that we sent this —
     // otherwise the next identical transition is skipped as a no-op and the
     // frontend and backend disagree about the filter for the rest of the
@@ -115,12 +118,12 @@ export async function syncCatalog(): Promise<void> {
   syncInProgress = true;
   try {
     const result = await commands.syncFullCatalog(handle);
-    console.info(
-      `[OfflineCatalog] Synced ${result.itemsCached} items (${result.librariesFailed} libraries failed)`
+    log.info(
+      `Synced ${result.itemsCached} items (${result.librariesFailed} libraries failed)`
     );
     await refreshSyncStatus();
   } catch (err) {
-    console.warn("[OfflineCatalog] Full catalog sync failed:", err);
+    log.warn("Full catalog sync failed:", err);
   } finally {
     syncInProgress = false;
   }
@@ -136,12 +139,12 @@ export async function resumeQueued(): Promise<void> {
   try {
     const result = await commands.resumeQueuedDownloads(handle);
     if (result.resolved > 0 || result.failed > 0) {
-      console.info(
-        `[OfflineCatalog] Resumed queued downloads: ${result.resolved} resolved, ${result.failed} failed`
+      log.info(
+        `Resumed queued downloads: ${result.resolved} resolved, ${result.failed} failed`
       );
     }
   } catch (err) {
-    console.warn("[OfflineCatalog] Failed to resume queued downloads:", err);
+    log.warn("Failed to resume queued downloads:", err);
   }
 }
 
@@ -151,7 +154,7 @@ export async function refreshSyncStatus(): Promise<void> {
     const status = await commands.catalogSyncStatus();
     lastCatalogSync.set(status.lastSyncedAt ?? null);
   } catch (err) {
-    console.debug("[OfflineCatalog] Failed to fetch sync status:", err);
+    log.debug("Failed to fetch sync status:", err);
   }
 }