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/features/message-search/useLocalMessageSearch.ts

@@ -75,8 +75,7 @@ export const useLocalMessageSearch = () => {
             if (senderOnlyMode) continue;
             const evType = event.getType();
             const isSticker = evType === 'm.sticker';
-            const isPoll =
-              evType === 'm.poll.start' || evType === 'org.matrix.msc3381.poll.start';
+            const isPoll = evType === 'm.poll.start' || evType === 'org.matrix.msc3381.poll.start';
             if (!isSticker && !isPoll) continue;
           }
 
@@ -90,9 +89,7 @@ export const useLocalMessageSearch = () => {
           // Sender-only mode: no text filter needed
           if (!senderOnlyMode) {
             const evType = event.getType();
-            const isSticker = evType === 'm.sticker';
-            const isPoll =
-              evType === 'm.poll.start' || evType === 'org.matrix.msc3381.poll.start';
+            const isPoll = evType === 'm.poll.start' || evType === 'org.matrix.msc3381.poll.start';
 
             let body = '';
             let formattedBody = '';