fix(a11y): correct call-control aria + picker/recorder/live-chip UX (DP7-DP12)

DP7: fix inverted Deafen/Undeafen aria-label on the sound button so it
  matches the action and tooltip.
DP8: add aria-pressed to Sound/Video/ScreenShare toggles and align the
  Microphone toggle to the same "pressed = feature on/active" semantic.
DP9: return focus to the trigger when the GifPicker closes and cap its
  fixed width to min(312px, calc(100vw - 16px)) so it can't overflow
  narrow viewports.
DP10: drop redundant mouse-only clear onClick nested inside the search
  filter Chip buttons (parent chip/menu already performs the clear);
  the cross icons are now purely decorative.
DP11: constrain the voice recorder widget and let the waveform shrink so
  it fits a narrow composer, and expose the live duration as a role="timer"
  snapshot instead of spamming a screen reader every 100ms.
DP12: announce the live-call participant count via a visually-hidden
  role="status" region.

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

src/app/features/call-status/CallControl.tsx

@@ -35,7 +35,7 @@ function MicrophoneButton({ enabled, onToggle, disabled }: MicrophoneButtonProps
           outlined
           disabled={disabled || loading}
           aria-label={enabled ? 'Turn off microphone' : 'Turn on microphone'}
-          aria-pressed={!enabled}
+          aria-pressed={enabled}
         >
           <Icon size="100" src={enabled ? Icons.Mic : Icons.MicMute} filled={!enabled} />
         </IconButton>
@@ -67,7 +67,8 @@ function SoundButton({ enabled, onToggle, disabled }: SoundButtonProps) {
           radii="300"
           size="300"
           onClick={() => onToggle()}
-          aria-label={enabled ? 'Undeafen' : 'Deafen'}
+          aria-label={enabled ? 'Deafen' : 'Undeafen'}
+          aria-pressed={enabled}
           outlined
           disabled={disabled}
         >
@@ -109,6 +110,7 @@ function VideoButton({ enabled, onToggle, disabled }: VideoButtonProps) {
           size="300"
           onClick={toggleVideo}
           aria-label={enabled ? 'Stop Video' : 'Start Video'}
+          aria-pressed={enabled}
           outlined
           disabled={disabled || loading}
         >
@@ -147,6 +149,7 @@ function ScreenShareButton({ enabled, onToggle, disabled }: ScreenShareButtonPro
           size="300"
           onClick={onToggle}
           aria-label={enabled ? 'Stop Screenshare' : 'Start Screenshare'}
+          aria-pressed={enabled}
           outlined
           disabled={disabled}
         >