iOS / iPadOS / Android have no hardware keyboard for the user to
bind a PTT key on. Up to now the VoiceBar showed only a
'Push to talk: bound key —' hint that didn't lead anywhere usable.
Add a touch-and-hold on-screen PTT button rendered only on
touch-only platforms (Platform.isIOS || Platform.isAndroid; web
hosts and desktop continue to use the hardware-key path
unchanged).
apps/chanora_flutter/lib/widgets/voice_bar.dart:
* New module-private `_isTouchOnlyPttHost` predicate.
* VoiceBar gains an `onPttHeldChanged: ValueChanged<bool>`
constructor param. Desktop callers wire it but never invoke it
because the button is not rendered there.
* Row 3 (the PTT-only secondary content) now branches:
- on touch-only hosts -> renders the new `_PttHoldButton` plus
a small release-tail hint underneath
- on hardware-keyboard hosts -> renders the same bound-key +
release-tail one-liner as before, unchanged.
* New `_PttHoldButton` StatefulWidget. Uses a single
GestureDetector covering onTapDown / onTapUp / onTapCancel /
onPanDown / onPanEnd / onPanCancel so the held edges fire on
finger-down and the released edge fires when the user lifts
OR drags off OR another gesture in the arena wins. Visual
feedback mirrors the level-meter active flag.
apps/chanora_flutter/lib/main.dart:
* New `_onOnscreenPttHeldChanged(bool held)` method that calls
`rust.setPtt(active: held)`. The bridge's set_ptt routes the
edge through the same release-tail timer + transmit-mode
selector that desktop hardware keys use (SDD-096 / SAD-083),
so behaviour parity is preserved.
flutter analyze: clean (6 pre-existing Radio.groupValue infos).
flutter build ios --release --no-codesign: clean (Runner.app 29.9 MB).
DEC-025: iPhone + iPad + Android in scope; this commit makes PTT
mode actually usable on those platforms. The 'Focused' capability
badge wording in ios-p0-acceptance.md / ipad-p0-acceptance.md
already documents the on-screen button as the only PTT input;
this commit makes that documentation true.
EdisonJwa
278df25fd7