fix(calls): harden ML denoise shim against static; fix lint/format

ML noise suppression produced loud static on real calls. RNNoise requires
mono 48kHz float input; feeding it stereo or wrong-rate data is the classic
cause of that static. Harden the shim:
- request mono (channelCount:1) + 48kHz capture
- run a 48kHz AudioContext and BAIL to the raw mic if the browser won't
  give a true 48kHz context (wrong-rate data -> static)
- force the worklet node to explicit mono in/out
- use the non-SIMD rnnoise.wasm (SIMD build artifacts on some GPUs)
- share one AudioContext across captures

Also fix the two CI-blocking eslint errors (unused vars in UrlPreviewCard
and useLocalMessageSearch) and apply repo-wide prettier formatting so
check:eslint and check:prettier pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/url-preview/UrlPreviewCard.tsx

@@ -1651,7 +1651,6 @@ function GenericCard({
   const title = prev['og:title'] ?? '';
   const description = prev['og:description'] ?? '';
   const siteName = typeof prev['og:site_name'] === 'string' ? prev['og:site_name'] : undefined;
-  const domain = getDomain(url);
 
   return (
     <>