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/player/adapters/html5Adapter.ts

@@ -20,6 +20,9 @@
  */
 
 import type { AdapterHost, PlayerAdapter, PlayerLoadOptions } from "./types";
+import { createLogger } from "$lib/utils/logger";
+
+const log = createLogger("Html5PlayerAdapter");
 
 /**
  * Narrow seam the owning component provides so the adapter can execute the
@@ -110,7 +113,7 @@ export class Html5PlayerAdapter implements PlayerAdapter {
         // play promise while the element keeps trying. Surfacing it would report
         // an error roughly once a second for the duration of the stall.
         if (isPlayInterruptedError(err)) {
-          console.debug("[Html5PlayerAdapter] play() interrupted by pause (stall recovery)");
+          log.debug("play() interrupted by pause (stall recovery)");
         } else {
           this.host.onError(`play() failed: ${err}`);
         }