Add fingerprint (local_auth) session + 3-min inactivity timeout (default), activity resets timer, settings: biometric toggle + timeout picker

lib/dashboard_screen.dart

@@ -29,17 +29,25 @@ class _DashboardScreenState extends State<DashboardScreen> {
   @override
   void initState() {
     super.initState();
-    _searchCtrl.addListener(_onSearchChanged);
+    _searchCtrl.addListener(() {
+      _touch(); // user activity
+      _onSearchChanged();
+    });
     _refresh();
   }
 
   @override
   void dispose() {
-    _searchCtrl.removeListener(_onSearchChanged);
     _searchCtrl.dispose();
     super.dispose();
   }
 
+  /// Refresh the session timestamp — called on every user interaction so the
+  /// 3-minute inactivity timeout only fires when the user is truly idle.
+  void _touch() {
+    widget.auth.openSession();
+  }
+
   void _onSearchChanged() => _refresh();
 
   Future<void> _refresh() async {
@@ -66,6 +74,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
   }
 
   Future<void> _editEntry(VaultEntry e) async {
+    _touch();
     final result = await showEntryDialog(
       context,
       title: 'Edit konten',
@@ -80,6 +89,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
   }
 
   Future<void> _addEntry() async {
+    _touch();
     final result = await showEntryDialog(
       context,
       title: 'Tambah entri baru',
@@ -110,13 +120,16 @@ class _DashboardScreenState extends State<DashboardScreen> {
           IconButton(
             icon: const Icon(Icons.settings),
             tooltip: 'Pengaturan',
-            onPressed: () => Navigator.push(
-              context,
-              MaterialPageRoute(
-                builder: (_) => SettingsScreen(
-                    auth: widget.auth, theme: widget.theme),
-              ),
-            ).then((_) => _refresh()),
+            onPressed: () {
+              _touch();
+              Navigator.push(
+                context,
+                MaterialPageRoute(
+                  builder: (_) => SettingsScreen(
+                      auth: widget.auth, theme: widget.theme),
+                ),
+              ).then((_) => _refresh());
+            },
           ),
         ],
       ),
@@ -139,6 +152,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
                     ? IconButton(
                         icon: const Icon(Icons.clear),
                         onPressed: () {
+                          _touch();
                           _searchCtrl.clear();
                           _refresh();
                         },
@@ -167,20 +181,20 @@ class _DashboardScreenState extends State<DashboardScreen> {
                               child: const Icon(Icons.delete, color: Colors.white),
                             ),
                             confirmDismiss: (_) async {
-                              // Use our own dialog for nicer copy.
+                              _touch();
                               final c = await showConfirmDialog(
                                 context,
                                 title: 'Hapus entri?',
-                                body:
-                                    'Yakin hapus "${e.id}"?',
+                                body: 'Yakin hapus "${e.id}"?',
                               );
                               if (c == true) await _deleteEntry(e);
-                              return false; // we handle deletion ourselves
+                              return false;
                             },
                             child: Card(
                               margin: const EdgeInsets.symmetric(
                                   horizontal: 12, vertical: 6),
                               child: ExpansionTile(
+                                onExpansionChanged: (_) => _touch(),
                                 title: Text(e.id,
                                     style: const TextStyle(
                                         fontWeight: FontWeight.bold)),