refactor(fe): DRY components, hooks, a11y fixes, and WS/client improvements

- Extract StatusBadge, SummaryList, ProfileDetail shared components (~300 lines deduplicated)
- Extract usePaginatedList<T>, useItemDetail<T> generic hooks (~170 lines deduplicated)
- Fix a11y: Badge (role=status, dark variants), Button (aria-disabled, motion-safe), Input (aria-invalid, errorId), Select (error variant), Skeleton (aria-hidden), MobileTabBar (full tab ARIA), Toast (timer leak fix, role=alert, keyboard dismiss), Card (role=region)
- Fix API client: buildSearchParams helper, request timeout, password caching, named types
- Fix WS: typed 24 event payloads (was all unknown), exponential backoff reconnect, max 20 attempts, msg.data guard
- Fix bug: listDashboardChannels cursor pagination was silently dropped
- Remove duplicate shimmer keyframes from tailwind.config.js
- Fix WaveformPlayer non-null assertion

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

services/frontend/src/shared/hooks/useAudioTransmit.ts

@@ -41,11 +41,9 @@ function sendWsCommand(
   return false;
 }
 
-export function useAudioTransmit(
-  socketRef: {
-    readonly current: WebSocket | null;
-  },
-): {
+export function useAudioTransmit(socketRef: {
+  readonly current: WebSocket | null;
+}): {
   isStreaming: boolean;
   micError: string | null;
   micLevel: number;
@@ -195,5 +193,14 @@ export function useAudioTransmit(
     }
   }, [isStreaming, startTransmit, stopTransmit, start]);
 
-  return { isStreaming, micError, micLevel, toggle, stopTransmit, startTransmit, stop, start };
+  return {
+    isStreaming,
+    micError,
+    micLevel,
+    toggle,
+    stopTransmit,
+    startTransmit,
+    stop,
+    start,
+  };
 }