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;
     }
   }