fix(a11y): call toggles no longer contradict their labels (#187 DP7/8)

The call-bar and status-bar toggles change their label with the state
("Deafen"/"Undeafen", "Turn off/on microphone", "Start/Stop Video", …)
AND set aria-pressed, which made screen readers say "Deafen, pressed"
while you were not deafened, and gave mic/screenshare a pressed state in
one bar but not the other. Per the ARIA practice, a toggle uses either a
changing action label or aria-pressed with a fixed label; these use the
former, so aria-pressed is removed from all nine.

Checked in a live call: every control now announces only its action, in
both states (deafen → "Undeafen", mic → "Turn on microphone", …).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

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

@@ -40,7 +40,6 @@ function MicrophoneButton({ enabled, onToggle, disabled }: MicrophoneButtonProps
           outlined
           disabled={disabled || loading}
           aria-label={enabled ? 'Turn off microphone' : 'Turn on microphone'}
-          aria-pressed={enabled}
         >
           <Icon size="100" src={enabled ? Icons.Mic : Icons.MicMute} filled={!enabled} />
         </IconButton>
@@ -73,8 +72,10 @@ function SoundButton({ enabled, onToggle, disabled }: SoundButtonProps) {
           size="300"
           className={MobileTouchTarget}
           onClick={() => onToggle()}
+          // No aria-pressed on these call toggles (#187 DP7/8): their labels already
+          // name the action ("Deafen" / "Undeafen"), and pressed-state on top
+          // read as "Deafen, pressed" while NOT deafened.
           aria-label={enabled ? 'Deafen' : 'Undeafen'}
-          aria-pressed={enabled}
           outlined
           disabled={disabled}
         >
@@ -117,7 +118,6 @@ function VideoButton({ enabled, onToggle, disabled }: VideoButtonProps) {
           className={MobileTouchTarget}
           onClick={toggleVideo}
           aria-label={enabled ? 'Stop Video' : 'Start Video'}
-          aria-pressed={enabled}
           outlined
           disabled={disabled || loading}
         >
@@ -157,7 +157,6 @@ function ScreenShareButton({ enabled, onToggle, disabled }: ScreenShareButtonPro
           className={MobileTouchTarget}
           onClick={onToggle}
           aria-label={enabled ? 'Stop Screenshare' : 'Start Screenshare'}
-          aria-pressed={enabled}
           outlined
           disabled={disabled}
         >