[karlitschek]

Holding the mute button or the space bar already unmutes the microphone while held (push to talk). As the finger covers the mute button, it was hard to tell that the microphone is really on.

• A green "You are talking" pill is shown above the call buttons while push to talk is active
• VoiceOver announces it, releasing gives a light haptic
• Fixes releasing the space bar calling super.pressesBegan instead of super.pressesEnded
• Ends push to talk when the key press is cancelled, e.g. when the app goes to the background

Notes

• Based on feat: Widgets, Spotlight, haptics, double tap reactions and thermal aware calls #2788 (widgets, haptics, double tap reactions, thermal aware calls). GitHub retargets this PR to main once feat: Widgets, Spotlight, haptics, double tap reactions and thermal aware calls #2788 is merged.
• Part of a set of independent feature PRs, each can be reviewed, merged or dropped on its own. Where several of them add a switch to Settings, the later one needs a trivial rebase.

Testing

• App and all extensions build for the simulator (Xcode 27.1)
• The combined branch with all features also builds in Release for generic/platform=iOS (iPhone, iPad, Mac "Designed for iPad") and for watchOS hardware
• Not yet tried by hand with a real account and device, hence the draft.

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