fix(navigation): dynamically update bottom navigation items

app/src/main/java/com/m57/hermescontrol/Navigation.kt

@@ -179,12 +179,11 @@ fun MainNavigation() {
     val scope = rememberCoroutineScope()
 
     // Read dynamic bottom-nav config.
-    // NB: deliberately NOT wrapped in remember { … } — AuthManager values change
-    // when the user customises items in Settings (saved to SharedPreferences).
-    // Without a key that tracks prefs changes, remember would cache the stale
-    // defaults and the NavigationBar would never reflect the user's picks.
-    // Reading fresh on every recomposition is negligible (pure map over 18 items).
-    val bottomNavItems = resolveBottomNavItems(AuthManager.getBottomNavItems())
+    // AuthManager.bottomNavItemsFlow is a StateFlow that emits updates when the user
+    // customises items in Settings. Using collectAsState() ensures the NavigationBar
+    // recomposes and reflects choices instantly.
+    val bottomNavItemsState by AuthManager.bottomNavItemsFlow.collectAsState()
+    val bottomNavItems = resolveBottomNavItems(bottomNavItemsState)
     val bottomNavKeys = remember(bottomNavItems) { bottomNavItems.map { it.key }.toSet() }
 
     // Sync primary screens to NavigationController