Home Screen: Inform on connection lose

lib/providers/busylight_provider.dart

@@ -149,6 +149,11 @@ final colorProvider = StateNotifierProvider<ColorNotifier, BusylightColor>(
   },
 );
 
+// ── Connection lost indicator ─────────────────────────────────────────────────
+// Set to true by the polling notifier when a poll fails, false on success.
+
+final connectionLostProvider = StateProvider<bool>((_) => false);
+
 // ── Background polling ────────────────────────────────────────────────────────
 // Periodically pulls status + color from the device and silently updates state.
 
@@ -181,8 +186,11 @@ class PollingNotifier extends StateNotifier<void> {
       _ref.read(busylightStatusProvider.notifier).setLocalStatus(status);
       _ref.read(colorProvider.notifier).silentSet(color);
       _ref.read(brightnessProvider.notifier).silentSet(color.brightness);
+      // Connection restored — clear the lost flag
+      _ref.read(connectionLostProvider.notifier).state = false;
     } catch (_) {
-      // Silently ignore poll errors — connection issues are shown on manual refresh
+      // Signal connectivity issue to the UI
+      _ref.read(connectionLostProvider.notifier).state = true;
     }
   }
 

lib/screens/home_screen.dart

@@ -122,6 +122,7 @@ class _BodyState extends ConsumerState<_Body> {
     final brightness     = ref.watch(brightnessProvider);
     final color          = ref.watch(colorProvider);
     final presets        = ref.watch(presetsProvider);
+    final connectionLost = ref.watch(connectionLostProvider);
 
     final status = statusAsync.valueOrNull ?? BusylightStatus.off;
     final displayColor = _statusColor(status, color);
@@ -129,7 +130,7 @@ class _BodyState extends ConsumerState<_Body> {
     return ListView(
       padding: const EdgeInsets.all(24),
       children: [
-        // Live color preview dot
+        // Live color preview dot — shows wifi-off icon when connection lost
         Center(
           child: AnimatedContainer(
             duration: const Duration(milliseconds: 400),
@@ -137,10 +138,12 @@ class _BodyState extends ConsumerState<_Body> {
             height: 100,
             decoration: BoxDecoration(
               shape: BoxShape.circle,
-              color: status == BusylightStatus.off
+              color: connectionLost
+                  ? Colors.grey.shade900
+                  : status == BusylightStatus.off
                       ? Colors.grey.shade900
                       : displayColor.withOpacity(brightness),
-              boxShadow: status != BusylightStatus.off
+              boxShadow: (!connectionLost && status != BusylightStatus.off)
                   ? [BoxShadow(
                       color: displayColor.withOpacity(0.5 * brightness),
                       blurRadius: 40,
@@ -148,13 +151,20 @@ class _BodyState extends ConsumerState<_Body> {
                     )]
                   : null,
             ),
+            child: connectionLost
+                ? const Icon(Icons.wifi_off, color: Colors.grey, size: 36)
+                : null,
           ),
         ),
         const SizedBox(height: 12),
         Center(
           child: Text(
-            status.label.toUpperCase(),
-            style: const TextStyle(color: Colors.grey, letterSpacing: 2, fontSize: 13),
+            connectionLost ? 'NO CONNECTION' : status.label.toUpperCase(),
+            style: TextStyle(
+              color: connectionLost ? Colors.red.shade700 : Colors.grey,
+              letterSpacing: 2,
+              fontSize: 13,
+            ),
           ),
         ),
         const SizedBox(height: 36),
@@ -177,9 +187,11 @@ class _BodyState extends ConsumerState<_Body> {
             BusylightStatus.off,
           ].map((s) => StatusButton(
             status: s,
-            isActive: status == s,
+            isActive: !connectionLost && status == s,
             isPending: _pendingStatus == s,
-            onTap: _pendingStatus == null ? () => _setStatus(s) : () {},
+            onTap: (!connectionLost && _pendingStatus == null)
+                ? () => _setStatus(s)
+                : () {},
           )).toList(),
         ),
         const SizedBox(height: 32),
@@ -188,7 +200,7 @@ class _BodyState extends ConsumerState<_Body> {
         _PresetsScroller(
           presets: presets,
           pendingPresetId: _pendingPresetId,
-          onPresetTap: (_pendingStatus == null && _pendingPresetId == null)
+          onPresetTap: (!connectionLost && _pendingStatus == null && _pendingPresetId == null)
               ? _applyPreset
               : (_) {},
           onPresetDelete: (preset) => ref.read(presetsProvider.notifier).remove(preset.id),