fix: prevent unnecessary service lifecycle on startup for non-users

- stop() now uses stopService() instead of startService(STOP intent).
  stopService() is a no-op when the service isn't running and avoids
  starting a service just to stop it, which could throw on Android 12+.

- disableAllLayers() only runs when transitioning from enabled → disabled,
  not on initial load with false. Users who never enabled the service
  won't trigger any service/WorkManager/AlarmManager calls on login.

https://claude.ai/code/session_01LEPfmgGnwjB9a5SDFw5U8t

amethyst/src/main/java/com/vitorpamplona/amethyst/service/notifications/AlwaysOnNotificationServiceManager.kt

@@ -50,19 +50,23 @@ class AlwaysOnNotificationServiceManager(
     }
 
     private var watchJob: Job? = null
+    private var wasEnabled = false
 
     /**
      * Starts watching the given account's always-on setting.
      * When the setting changes, all layers are started or stopped accordingly.
+     * On initial load with false, nothing happens (no-op for users who never enabled it).
      */
     fun watchAccount(account: Account) {
         watchJob?.cancel()
+        wasEnabled = false
         watchJob =
             scope.launch {
                 account.settings.alwaysOnNotificationService.collectLatest { enabled ->
                     if (enabled) {
+                        wasEnabled = true
                         enableAllLayers()
-                    } else {
+                    } else if (wasEnabled) {
                         disableAllLayers()
                     }
                 }

amethyst/src/main/java/com/vitorpamplona/amethyst/service/notifications/NotificationRelayService.kt

@@ -95,11 +95,7 @@ class NotificationRelayService : Service() {
         }
 
         fun stop(context: Context) {
-            val intent =
+            context.stopService(Intent(context, NotificationRelayService::class.java))
-                Intent(context, NotificationRelayService::class.java).apply {
-                    action = ACTION_STOP
-                }
-            context.startService(intent)
         }
 
         fun isEnabled(context: Context): Boolean =