chore: restore product scaffold to rollback baseline

apps/chanora_flutter/lib/widgets/voice_compact.dart

@@ -358,7 +358,6 @@ Future<void> showVoiceDetailsSheet(
   required String pttBoundInputClass,
   required bool isTouchOnly,
   required rust.BridgeAudioProcessingConfig initialAudioConfig,
-  bool onnxRuntimeAvailable = true,
   required ValueChanged<rust.BridgeTransmitMode> onModeChanged,
   required ValueChanged<int> onReleaseTailChanged,
   required ValueChanged<rust.BridgeAudioProcessingConfig> onAudioConfigChanged,
@@ -389,7 +388,6 @@ Future<void> showVoiceDetailsSheet(
           pttBoundInputClass: pttBoundInputClass,
           isTouchOnly: isTouchOnly,
           initialAudioConfig: initialAudioConfig,
-          onnxRuntimeAvailable: onnxRuntimeAvailable,
           onModeChanged: onModeChanged,
           onReleaseTailChanged: onReleaseTailChanged,
           onAudioConfigChanged: onAudioConfigChanged,
@@ -413,7 +411,6 @@ class _VoiceSheetBody extends StatefulWidget {
     required this.pttBoundInputClass,
     required this.isTouchOnly,
     required this.initialAudioConfig,
-    required this.onnxRuntimeAvailable,
     required this.onModeChanged,
     required this.onReleaseTailChanged,
     required this.onAudioConfigChanged,
@@ -431,7 +428,6 @@ class _VoiceSheetBody extends StatefulWidget {
   final String pttBoundInputClass;
   final bool isTouchOnly;
   final rust.BridgeAudioProcessingConfig initialAudioConfig;
-  final bool onnxRuntimeAvailable;
   final ValueChanged<rust.BridgeTransmitMode> onModeChanged;
   final ValueChanged<int> onReleaseTailChanged;
   final ValueChanged<rust.BridgeAudioProcessingConfig> onAudioConfigChanged;
@@ -466,10 +462,6 @@ class _VoiceSheetBodyState extends State<_VoiceSheetBody> {
     _audioProcessing = AudioProcessingConfigState.fromConfig(
       widget.initialAudioConfig,
     );
-    _audioProcessing.vadBackend = normalizedVadBackend(
-      _audioProcessing.vadBackend,
-      onnxRuntimeAvailable: widget.onnxRuntimeAvailable,
-    );
 
     // Poll audio stats at 250 ms so TX/RX counters and the level meter
     // update in real time while the sheet is open, independent of the parent.
@@ -785,32 +777,15 @@ class _VoiceSheetBodyState extends State<_VoiceSheetBody> {
             const SizedBox(height: 2),
             SegmentedButton<rust.BridgeVadBackend>(
               style: voiceSegmentedButtonStyle(theme),
-              segments: vadBackendSegmentsForAvailability(
-                desktop: _isDesktopSileroVadHost,
-                onnxRuntimeAvailable: widget.onnxRuntimeAvailable,
-              ),
+              segments: _isDesktopSileroVadHost
+                  ? desktopVadBackendSegments
+                  : vadBackendSegments,
               selected: {_audioProcessing.vadBackend},
               onSelectionChanged: (s) {
-                setState(
-                  () => _audioProcessing.vadBackend = normalizedVadBackend(
-                    s.first,
-                    onnxRuntimeAvailable: widget.onnxRuntimeAvailable,
-                  ),
-                );
+                setState(() => _audioProcessing.vadBackend = s.first);
                 _notifyAudioConfig();
               },
             ),
-            if (_isDesktopSileroVadHost) ...[
-              const SizedBox(height: 4),
-              Text(
-                widget.onnxRuntimeAvailable
-                    ? 'Silero needs ONNX Runtime. WebRTC works without it.'
-                    : 'Silero is unavailable because ONNX Runtime was not found. WebRTC is selected.',
-                style: theme.textTheme.bodySmall?.copyWith(
-                  color: theme.colorScheme.onSurfaceVariant,
-                ),
-              ),
-            ],
 
             // Debug.
             const SizedBox(height: 8),