feat: integrate chat voice and diagnostics client

apps/chanora_flutter/lib/widgets/voice_haptics.dart

@@ -0,0 +1,16 @@
+import 'dart:async' show unawaited;
+
+import 'package:haptic_kit/haptic_kit.dart';
+
+/// Prepare mobile haptics without surfacing platform failures.
+void prepareVoiceHaptics() {
+  unawaited(Haptics.prepare().catchError((_) => false));
+}
+
+/// Play the standard touch PTT haptic without surfacing platform failures.
+void playVoicePttHaptic(bool held) {
+  final haptic = held
+      ? Haptics.impact(HapticImpactStyle.medium)
+      : Haptics.selection();
+  unawaited(haptic.catchError((_) {}));
+}