feat: grab sensor firmware version for detail sheet

lib/features/sensors/sensor_detail_sheet.dart

@@ -89,6 +89,7 @@ class _SensorDetailSheetState extends ConsumerState<SensorDetailSheet> {
   Widget build(BuildContext context) {
     final sensorAsync = ref.watch(sensorProvider(widget.sensorId));
     final roomsAsync = ref.watch(roomsProvider);
+    final versionAsync = ref.watch(sensorVersionProvider(widget.sensorId));
 
     return sensorAsync.when(
       loading: () => const SizedBox(
@@ -110,9 +111,12 @@ class _SensorDetailSheetState extends ConsumerState<SensorDetailSheet> {
               ?.name,
         );
 
+        final version = versionAsync.whenOrNull(data: (v) => v);
+
         return _SheetBody(
           sensor: sensor,
           roomName: roomName,
+          version: version,
           editing: _editing,
           nameCtrl: _nameCtrl,
           onEditToggle: () => setState(() {
@@ -132,6 +136,7 @@ class _SheetBody extends StatelessWidget {
   const _SheetBody({
     required this.sensor,
     required this.roomName,
+    required this.version,
     required this.editing,
     required this.nameCtrl,
     required this.onEditToggle,
@@ -142,6 +147,7 @@ class _SheetBody extends StatelessWidget {
 
   final Sensor sensor;
   final String? roomName;
+  final String? version;
   final bool editing;
   final TextEditingController nameCtrl;
   final VoidCallback onEditToggle;
@@ -210,6 +216,7 @@ class _SheetBody extends StatelessWidget {
                   ? '(${sensor.x!.toStringAsFixed(2)}, ${sensor.y!.toStringAsFixed(2)})'
                   : 'Not placed',
             ),
+            _InfoRow(label: 'Firmware', value: version ?? '—'),
             const SizedBox(height: 24),
             FilledButton.icon(
               icon: Icon(Icons.my_location),