refactor(call): move noise-suppression toggle out of the call bar

Default flipped to off so voice doesn't get coloured by browser NS on
first run. Users turn it on explicitly under Settings → Sprache, where
the toggle already lived before the in-call button shipped.

The in-call SparklesIcon button and all the associated wiring
(onToggleNoiseSuppression, noiseSuppression prop, local subscription
in InCallPanel) is removed. The hot-swap UX is preserved: a new
subscribeAudioSettings watcher in CallContext detects noiseSuppression
flips during an active call and re-runs setupMicPipeline so the change
takes effect without rejoining.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop/src/components/CallControls.tsx

@@ -9,7 +9,6 @@ import {
   MonitorStopIcon,
   MusicIcon,
   PhoneOffIcon,
-  SparklesIcon,
   UsersIcon,
   VideoIcon,
 } from './icons';
@@ -19,7 +18,6 @@ interface Props {
   sharing: boolean;
   video: boolean;
   deafened: boolean;
-  noiseSuppression?: boolean;
   onToggleMute: () => void;
   onToggleShare: () => void;
   /** Right-click on the share button opens the quality picker dialog while
@@ -28,7 +26,6 @@ interface Props {
   onShareContextMenu?: (e: React.MouseEvent) => void;
   onToggleVideo?: () => void;
   onToggleDeafen: () => void;
-  onToggleNoiseSuppression?: () => void;
   onHangup: () => void;
   onOpenParticipants?: () => void;
   /** Toggle the in-call soundboard popover. Active = panel currently open. */
@@ -48,13 +45,11 @@ export function CallControls({
   sharing,
   video,
   deafened,
-  noiseSuppression,
   onToggleMute,
   onToggleShare,
   onShareContextMenu,
   onToggleVideo,
   onToggleDeafen,
-  onToggleNoiseSuppression,
   onHangup,
   onOpenParticipants,
   onToggleSoundboard,
@@ -134,26 +129,6 @@ export function CallControls({
           <MonitorShareIcon className="h-5 w-5" />
         )}
       </CallButton>
-      {onToggleNoiseSuppression && (
-        <CallButton
-          label={
-            noiseSuppression
-              ? t('app:call.ns_off', {
-                  defaultValue: 'Rauschunterdrückung aus',
-                })
-              : t('app:call.ns_on', {
-                  defaultValue: 'Rauschunterdrückung an',
-                })
-          }
-          active={noiseSuppression ?? false}
-          activeTone="accent"
-          onClick={onToggleNoiseSuppression}
-          glass={glass}
-          className={btnSize}
-        >
-          <SparklesIcon className="h-5 w-5" />
-        </CallButton>
-      )}
       {onToggleSoundboard && (
         <CallButton
           label={t('app:soundboard.toggle', { defaultValue: 'Soundboard' })}