feat(ui): overhaul device details layout

lib/pages/device_details_page.dart

@@ -713,9 +713,11 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
   @override
   Widget build(BuildContext context) {
     final connectionData = ref.watch(connectionStatusProvider).valueOrNull;
-    final isCurrentConnected = connectionData != null &&
+    final currentConnectionStatus = connectionData != null &&
-        connectionData.$1 == ConnectionStatus.connected &&
+            connectionData.$2 == widget.deviceAddress
-        connectionData.$2 == widget.deviceAddress;
+        ? connectionData.$1
+        : ConnectionStatus.disconnected;
+    final isCurrentConnected = currentConnectionStatus == ConnectionStatus.connected;
     final canSelectFirmware =
         isCurrentConnected && !_isSelectingFirmware && !_isFirmwareUpdateBusy;
     final canStartFirmware = isCurrentConnected &&
@@ -731,7 +733,7 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
       },
       child: Scaffold(
         appBar: AppBar(
-          title: const Text('Device Details'),
+          title: const Text('Device'),
           leading: IconButton(
             icon: const Icon(Icons.arrow_back),
             onPressed: _exitPage,
@@ -741,15 +743,25 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
           fit: StackFit.expand,
           children: [
             SingleChildScrollView(
-              padding: const EdgeInsets.all(16),
+              padding: const EdgeInsets.fromLTRB(20, 16, 20, 24),
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
-                  _buildDeviceInfo(context, ref, widget.deviceAddress),
+                  _buildDeviceOverviewCard(
-                  const SizedBox(height: 16),
+                    context,
-                  _buildConnectionStatus(context, ref, widget.deviceAddress),
+                    ref,
-                  const SizedBox(height: 16),
+                    widget.deviceAddress,
+                    connectionStatus: currentConnectionStatus,
+                    status: _latestStatus,
+                  ),
+                  const SizedBox(height: 20),
                   if (isCurrentConnected) ...[
+                    _TrainerConnectionCard(
+                      status: _latestStatus,
+                      onAssign: _isFirmwareUpdateBusy ? null : _connectButtonToBike,
+                      onShowStatusConsole: _showStatusHistory,
+                    ),
+                    const SizedBox(height: 16),
                     _StatusBanner(
                       status: _latestStatus,
                       onTap: _showStatusHistory,
@@ -763,16 +775,6 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
                             },
                     ),
                     const SizedBox(height: 16),
-                    SizedBox(
-                      width: double.infinity,
-                      child: FilledButton.icon(
-                        onPressed:
-                            _isFirmwareUpdateBusy ? null : _connectButtonToBike,
-                        icon: const Icon(Icons.link),
-                        label: const Text('Connect Button to Bike'),
-                      ),
-                    ),
-                    const SizedBox(height: 16),
                     _FirmwareUpdateCard(
                       selectedFirmware: _selectedFirmware,
                       progress: _dfuProgress,
@@ -814,6 +816,8 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
                         ),
                       ),
                     ),
+                  ] else ...[
+                    const _DisconnectedDetailCard(),
                   ],
                 ],
               ),
@@ -827,8 +831,14 @@ class _DeviceDetailsPageState extends ConsumerState<DeviceDetailsPage> {
                       margin: const EdgeInsets.symmetric(horizontal: 24),
                       padding: const EdgeInsets.all(20),
                       decoration: BoxDecoration(
-                        color: Theme.of(context).cardColor,
+                        color: Theme.of(context).colorScheme.surface,
-                        borderRadius: BorderRadius.circular(16),
+                        borderRadius: BorderRadius.circular(24),
+                        border: Border.all(
+                          color: Theme.of(context)
+                              .colorScheme
+                              .outlineVariant
+                              .withValues(alpha: 0.55),
+                        ),
                       ),
                       child: Column(
                         mainAxisSize: MainAxisSize.min,
@@ -916,23 +926,30 @@ class _FirmwareUpdateCard extends StatelessWidget {
     final theme = Theme.of(context);
     final colorScheme = theme.colorScheme;
 
-    return Container(
+    return Card(
-      decoration: BoxDecoration(
+      child: Padding(
-        borderRadius: BorderRadius.circular(16),
+        padding: const EdgeInsets.fromLTRB(18, 18, 18, 18),
-        color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.55),
-        border: Border.all(
-          color: colorScheme.outlineVariant.withValues(alpha: 0.6),
-        ),
-      ),
-      padding: const EdgeInsets.fromLTRB(14, 12, 14, 14),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          Row(
+            children: [
+              Icon(Icons.system_update_alt_rounded, color: colorScheme.primary),
+              const SizedBox(width: 10),
               const Text(
                 'Firmware Update',
-            style: TextStyle(fontSize: 17, fontWeight: FontWeight.w700),
+                style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700),
               ),
-          const SizedBox(height: 10),
+            ],
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'Select a firmware image, review the transfer state, and start the update when ready.',
+            style: theme.textTheme.bodyMedium?.copyWith(
+              color: colorScheme.onSurface.withValues(alpha: 0.68),
+            ),
+          ),
+          const SizedBox(height: 14),
           Wrap(
             spacing: 8,
             runSpacing: 8,
@@ -966,12 +983,23 @@ class _FirmwareUpdateCard extends StatelessWidget {
               ),
             ],
           ),
-          const SizedBox(height: 10),
+          const SizedBox(height: 14),
+          Container(
+            padding: const EdgeInsets.all(14),
+            decoration: BoxDecoration(
+              color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.54),
+              borderRadius: BorderRadius.circular(18),
+            ),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
                 Text(
                   selectedFirmware == null
                       ? 'Selected file: none'
                       : 'Selected file: ${selectedFirmware!.fileName}',
-            style: theme.textTheme.bodyMedium,
+                  style: theme.textTheme.bodyMedium?.copyWith(
+                    fontWeight: FontWeight.w600,
+                  ),
                 ),
           if (selectedFirmware != null) ...[
                   const SizedBox(height: 4),
@@ -980,12 +1008,17 @@ class _FirmwareUpdateCard extends StatelessWidget {
                     style: theme.textTheme.bodySmall,
                   ),
                 ],
-          const SizedBox(height: 10),
+              ],
+            ),
+          ),
+          const SizedBox(height: 14),
           Text('Phase: $phaseText', style: theme.textTheme.bodyMedium),
           if (_showProgress) ...[
-            const SizedBox(height: 8),
+            const SizedBox(height: 10),
             LinearProgressIndicator(
               value: progress.totalBytes > 0 ? progress.fractionComplete : 0,
+              minHeight: 10,
+              borderRadius: BorderRadius.circular(999),
             ),
             const SizedBox(height: 6),
             Text(
@@ -1016,6 +1049,7 @@ class _FirmwareUpdateCard extends StatelessWidget {
           ],
         ],
       ),
+      ),
     );
   }
 }
@@ -1038,23 +1072,42 @@ class _StatusBanner extends StatelessWidget {
     final text = status?.statusLine ?? 'Waiting for status updates...';
 
     return Material(
-      color: color.withValues(alpha: 0.16),
+      color: colorScheme.surface,
-      borderRadius: BorderRadius.circular(12),
+      borderRadius: BorderRadius.circular(22),
       child: InkWell(
-        borderRadius: BorderRadius.circular(12),
+        borderRadius: BorderRadius.circular(22),
         onTap: onTap,
         child: Padding(
-          padding: const EdgeInsets.all(12),
+          padding: const EdgeInsets.all(16),
+          child: Container(
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.circular(18),
+              border: Border.all(color: color.withValues(alpha: 0.32)),
+              color: color.withValues(alpha: 0.08),
+            ),
+            padding: const EdgeInsets.all(14),
             child: Row(
               children: [
-              Icon(Icons.memory, color: color),
+                Icon(Icons.memory_rounded, color: color),
-              const SizedBox(width: 10),
+                const SizedBox(width: 12),
                 Expanded(
-                child: Text(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Live Status',
+                        style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
                         text,
                         maxLines: 2,
                         overflow: TextOverflow.ellipsis,
                       ),
+                    ],
+                  ),
                 ),
                 if (onErrorInfoTap != null &&
                     status != null &&
@@ -1070,6 +1123,7 @@ class _StatusBanner extends StatelessWidget {
             ),
           ),
         ),
+      ),
     );
   }
 
@@ -1093,10 +1147,14 @@ class _StatusBanner extends StatelessWidget {
   }
 }
 
-Widget _buildDeviceInfo(
+Widget _buildDeviceOverviewCard(
   BuildContext context,
   WidgetRef ref,
   String deviceAddress,
+  {
+  required ConnectionStatus connectionStatus,
+  required CentralStatus? status,
+}
 ) {
   final asyncSavedDevices = ref.watch(nConnectedDevicesProvider);
 
@@ -1112,79 +1170,351 @@ Widget _buildDeviceInfo(
       }
 
       if (currentDeviceData == null) {
-        return Center(
+        return Card(
+          child: Padding(
+            padding: const EdgeInsets.all(18),
             child: Text('Device details not found for $deviceAddress.'),
+          ),
         );
       }
 
-      return Column(
+      // TODO(yannik): Replace these overview placeholder metrics with actual
+      // battery, signal, and firmware values once the device exposes them.
+      return _DeviceOverviewCard(
+        device: currentDeviceData,
+        connectionStatus: connectionStatus,
+        status: status,
+      );
+    },
+    loading: () => const Card(
+      child: Padding(
+        padding: EdgeInsets.all(18),
+        child: Center(child: CircularProgressIndicator()),
+      ),
+    ),
+    error: (error, stackTrace) => Card(
+      child: Padding(
+        padding: const EdgeInsets.all(18),
+        child: Text('Error loading device info: $error'),
+      ),
+    ),
+  );
+}
+
+class _DeviceOverviewCard extends StatelessWidget {
+  const _DeviceOverviewCard({
+    required this.device,
+    required this.connectionStatus,
+    required this.status,
+  });
+
+  final ConnectedDevice device;
+  final ConnectionStatus connectionStatus;
+  final CentralStatus? status;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final trainerAddress = status?.connectedTrainerAddr == null
+        ? 'No trainer assigned yet'
+        : formatMacAddressFromLittleEndian(status!.connectedTrainerAddr!);
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(18),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                ClipRRect(
+                  borderRadius: BorderRadius.circular(20),
+                  child: Image.asset(
+                    'assets/images/shifter-wireframe.png',
+                    width: 104,
+                    height: 78,
+                    fit: BoxFit.cover,
+                  ),
+                ),
+                const SizedBox(width: 16),
+                Expanded(
+                  child: Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
                       Text(
-            'Name: ${currentDeviceData.deviceName}',
+                        device.deviceName,
-            style: Theme.of(context).textTheme.titleLarge,
+                        style: Theme.of(context).textTheme.headlineSmall?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
                       ),
                       const SizedBox(height: 8),
+                      _DetailStatusChip(status: connectionStatus),
+                      const SizedBox(height: 10),
                       Text(
-            'Address: ${currentDeviceData.deviceAddress}',
+                        trainerAddress,
-            style: Theme.of(context).textTheme.bodyMedium,
+                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                              color: colorScheme.onSurface.withValues(alpha: 0.68),
+                            ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 18),
+            Row(
+              children: const [
+                Expanded(
+                  child: _OverviewMetricTile(
+                    label: 'Battery',
+                    value: '--',
+                    icon: Icons.battery_charging_full_rounded,
+                  ),
+                ),
+                SizedBox(width: 10),
+                Expanded(
+                  child: _OverviewMetricTile(
+                    label: 'Signal',
+                    value: 'Ready',
+                    icon: Icons.signal_cellular_alt_rounded,
+                  ),
+                ),
+                SizedBox(width: 10),
+                Expanded(
+                  child: _OverviewMetricTile(
+                    label: 'Firmware',
+                    value: '--',
+                    icon: Icons.memory_rounded,
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 14),
+            Text(
+              device.deviceAddress,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.onSurface.withValues(alpha: 0.62),
                   ),
-          const SizedBox(height: 8),
-          Text(
-            'Type: ${currentDeviceData.deviceType}',
-            style: Theme.of(context).textTheme.bodyMedium,
             ),
           ],
-      );
-    },
-    loading: () => const Center(child: CircularProgressIndicator()),
-    error: (error, stackTrace) =>
-        Center(child: Text('Error loading device info: $error')),
-  );
-}
-
-Widget _buildConnectionStatus(
-  BuildContext context,
-  WidgetRef ref,
-  String deviceAddress,
-) {
-  final asyncConnectionStatus = ref.watch(connectionStatusProvider);
-
-  return asyncConnectionStatus.when(
-    data: (data) {
-      final (status, connectedDeviceId) = data;
-      String statusText;
-      final isCurrentDeviceConnected =
-          connectedDeviceId != null && connectedDeviceId == deviceAddress;
-
-      if (isCurrentDeviceConnected) {
-        switch (status) {
-          case ConnectionStatus.connected:
-            statusText = 'Status: Connected';
-            break;
-          case ConnectionStatus.connecting:
-            statusText = 'Status: Connecting...';
-            break;
-          case ConnectionStatus.disconnecting:
-            statusText = 'Status: Disconnecting...';
-            break;
-          case ConnectionStatus.disconnected:
-            statusText = 'Status: Disconnected';
-            break;
-        }
-      } else {
-        statusText = 'Status: Disconnected';
-      }
-
-      return Text(statusText, style: Theme.of(context).textTheme.titleMedium);
-    },
-    loading: () => const Text(
-      'Status: Unknown',
-      style: TextStyle(fontStyle: FontStyle.italic),
         ),
-    error: (error, stackTrace) => Text(
-      'Status: Error ($error)',
-      style: const TextStyle(color: Colors.red),
       ),
     );
+  }
+}
+
+class _TrainerConnectionCard extends StatelessWidget {
+  const _TrainerConnectionCard({
+    required this.status,
+    required this.onAssign,
+    required this.onShowStatusConsole,
+  });
+
+  final CentralStatus? status;
+  final VoidCallback? onAssign;
+  final VoidCallback onShowStatusConsole;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final trainerText = status?.connectedTrainerAddr == null
+        ? 'No trainer assigned yet.'
+        : 'Assigned: ${formatMacAddressFromLittleEndian(status!.connectedTrainerAddr!)}';
+    final readinessText = status?.trainer.label ?? 'Waiting for trainer status';
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(18),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Container(
+                  width: 46,
+                  height: 46,
+                  decoration: BoxDecoration(
+                    shape: BoxShape.circle,
+                    color: colorScheme.primary.withValues(alpha: 0.12),
+                  ),
+                  child: Icon(Icons.pedal_bike_rounded, color: colorScheme.primary),
+                ),
+                const SizedBox(width: 14),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Trainer Assignment',
+                        style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                              fontWeight: FontWeight.w700,
+                            ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        trainerText,
+                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                              color: colorScheme.onSurface.withValues(alpha: 0.68),
+                            ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 14),
+            Container(
+              padding: const EdgeInsets.all(14),
+              decoration: BoxDecoration(
+                color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.54),
+                borderRadius: BorderRadius.circular(18),
+              ),
+              child: Row(
+                children: [
+                  Icon(Icons.bluetooth_connected_rounded, color: colorScheme.primary),
+                  const SizedBox(width: 10),
+                  Expanded(
+                    child: Text(
+                      readinessText,
+                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                            fontWeight: FontWeight.w600,
+                          ),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            const SizedBox(height: 14),
+            Row(
+              children: [
+                Expanded(
+                  child: FilledButton.icon(
+                    onPressed: onAssign,
+                    icon: const Icon(Icons.link_rounded),
+                    label: const Text('Assign Trainer'),
+                  ),
+                ),
+                const SizedBox(width: 10),
+                Expanded(
+                  child: OutlinedButton.icon(
+                    onPressed: onShowStatusConsole,
+                    icon: const Icon(Icons.subject_rounded),
+                    label: const Text('Status Console'),
+                  ),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _DisconnectedDetailCard extends StatelessWidget {
+  const _DisconnectedDetailCard();
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(18),
+        child: Text(
+          'This device is not currently connected. Reopen it from Devices to reconnect and manage trainer pairing, firmware, and gear ratios.',
+          style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: Theme.of(context)
+                    .colorScheme
+                    .onSurface
+                    .withValues(alpha: 0.68),
+              ),
+        ),
+      ),
+    );
+  }
+}
+
+class _DetailStatusChip extends StatelessWidget {
+  const _DetailStatusChip({required this.status});
+
+  final ConnectionStatus status;
+
+  @override
+  Widget build(BuildContext context) {
+    final (label, color) = switch (status) {
+      ConnectionStatus.connected => ('Connected', const Color(0xFF40C979)),
+      ConnectionStatus.connecting => ('Connecting', const Color(0xFFFFB649)),
+      ConnectionStatus.disconnecting => ('Disconnecting', const Color(0xFFFFB649)),
+      ConnectionStatus.disconnected =>
+        ('Disconnected', Theme.of(context).colorScheme.primary),
+    };
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+      decoration: BoxDecoration(
+        color: color.withValues(alpha: 0.12),
+        borderRadius: BorderRadius.circular(999),
+        border: Border.all(color: color.withValues(alpha: 0.24)),
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(Icons.check_circle_outline, size: 14, color: color),
+          const SizedBox(width: 6),
+          Text(
+            label,
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: color,
+                  fontWeight: FontWeight.w700,
+                ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _OverviewMetricTile extends StatelessWidget {
+  const _OverviewMetricTile({
+    required this.label,
+    required this.value,
+    required this.icon,
+  });
+
+  final String label;
+  final String value;
+  final IconData icon;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 12),
+      decoration: BoxDecoration(
+        color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.54),
+        borderRadius: BorderRadius.circular(16),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Icon(icon, size: 18, color: colorScheme.primary),
+          const SizedBox(height: 10),
+          Text(
+            label,
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurface.withValues(alpha: 0.62),
+                ),
+          ),
+          const SizedBox(height: 2),
+          Text(
+            value,
+            style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                  fontWeight: FontWeight.w700,
+                ),
+          ),
+        ],
+      ),
+    );
+  }
 }