search on budget + transactions; extended FAB for add tx; M3 expressive SearchBar

lib/app.dart

@@ -93,7 +93,7 @@ class _YnabAppState extends ConsumerState<YnabApp> {
           ),
         ),
         actions: [
-          TextButton(
+          FilledButton.tonal(
             onPressed: () => Navigator.pop(ctx),
             child: const Text('Annuler'),
           ),
@@ -139,14 +139,12 @@ class _YnabAppState extends ConsumerState<YnabApp> {
     return Scaffold(
       appBar: AppBar(
         title: _searchActive
-            ? TextField(
+            ? SearchBar(
                 controller: _searchController,
-                autofocus: true,
-                decoration: const InputDecoration(
-                  hintText: 'Rechercher…',
-                  border: InputBorder.none,
-                  isDense: true,
-                ),
+                hintText: 'Rechercher…',
+                leading: const Icon(Icons.search, size: 20),
+                padding: const WidgetStatePropertyAll(EdgeInsets.symmetric(horizontal: 4)),
+                constraints: BoxConstraints.tightFor(height: 44),
                 onChanged: (v) => ref.read(searchQueryProvider.notifier).state = v,
               )
             : Text(_navItems[selectedIndex].label),
@@ -158,13 +156,13 @@ class _YnabAppState extends ConsumerState<YnabApp> {
               tooltip: 'Fermer la recherche',
             )
           else ...[
-            if (selectedIndex == 0 || selectedIndex == 3)
+            if (selectedIndex == 0)
               IconButton(
                 icon: Icon(Icons.add, color: colorScheme.primary),
                 onPressed: _addTransaction,
                 tooltip: 'Ajouter une transaction',
               ),
-            if (selectedIndex == 2 || selectedIndex == 3)
+            if (selectedIndex >= 1)
               IconButton(
                 icon: Icon(Icons.search, color: colorScheme.onSurfaceVariant),
                 onPressed: _toggleSearch,
@@ -177,6 +175,13 @@ class _YnabAppState extends ConsumerState<YnabApp> {
         duration: const Duration(milliseconds: 200),
         child: _screens[selectedIndex],
       ),
+      floatingActionButton: selectedIndex == 3
+          ? FloatingActionButton.extended(
+              icon: const Icon(Icons.add),
+              label: const Text('Transaction'),
+              onPressed: _addTransaction,
+            )
+          : null,
       bottomNavigationBar: NavigationBar(
         selectedIndex: selectedIndex,
         onDestinationSelected: (int index) {

lib/screens/accounts_screen.dart

@@ -126,7 +126,7 @@ class _AccountCard extends ConsumerWidget {
               child: const Text('Supprimer'),
             ),
             const SizedBox(width: 8),
-            TextButton(
+            FilledButton.tonal(
               onPressed: () => Navigator.pop(ctx),
               child: const Text('Annuler'),
             ),

lib/screens/budget_screen.dart

@@ -12,10 +12,25 @@ class BudgetScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final groups = ref.watch(categoryGroupsProvider).valueOrNull ?? [];
     final catsByGroup = ref.watch(categoriesByGroupProvider);
+    final query = ref.watch(searchQueryProvider).toLowerCase();
     final now = DateTime.now();
     final months = ['', 'Janvier', 'Février', 'Mars', 'Avril', 'Mai', 'Juin', 'Juillet', 'Août', 'Septembre', 'Octobre', 'Novembre', 'Décembre'];
     final monthLabel = '${months[now.month]} ${now.year}';
 
+    // filter categories and groups by search query
+    final filteredGroups = query.isEmpty
+        ? groups
+        : groups.where((g) {
+            final cats = catsByGroup[g.id] ?? [];
+            return cats.any((c) => c.name.toLowerCase().contains(query));
+          }).toList();
+    final filteredCatsByGroup = query.isEmpty
+        ? catsByGroup
+        : catsByGroup.map((key, value) => MapEntry(
+            key,
+            value.where((c) => c.name.toLowerCase().contains(query)).toList(),
+          ));
+
     return ListView(
       padding: const EdgeInsets.fromLTRB(16, 8, 16, 90),
       children: [
@@ -33,8 +48,8 @@ class BudgetScreen extends ConsumerWidget {
           ),
         ),
         const SizedBox(height: 16),
-        ...groups.map((group) {
-          final cats = catsByGroup[group.id] ?? [];
+        ...filteredGroups.map((group) {
+          final cats = filteredCatsByGroup[group.id] ?? [];
           if (cats.isEmpty) return const SizedBox.shrink();
           return _CategoryGroupTile(group: group, categoryIds: cats.map((c) => c.id).toList());
         }),
@@ -119,7 +134,7 @@ class _CategoryRow extends ConsumerWidget {
             autofocus: true,
           ),
           actions: [
-            TextButton(onPressed: () => Navigator.pop(ctx), child: const Text('Annuler')),
+            FilledButton.tonal(onPressed: () => Navigator.pop(ctx), child: const Text('Annuler')),
             FilledButton(
               onPressed: () {
                 final v = double.tryParse(ctrl.text.trim().replaceAll(',', '.'));

lib/screens/dashboard_screen.dart

@@ -31,7 +31,7 @@ class DashboardScreen extends ConsumerWidget {
           mainAxisAlignment: MainAxisAlignment.spaceBetween,
           children: [
             Text('Transactions récentes', style: Theme.of(context).textTheme.titleMedium),
-            TextButton.icon(
+            FilledButton.tonalIcon(
               onPressed: () {},
               icon: const Icon(Icons.arrow_forward_ios, size: 14),
               label: const Text('Voir tout'),

lib/theme/app_theme.dart

@@ -123,6 +123,17 @@ final ThemeData ynabTheme = ThemeData(
     backgroundColor: kSurfaceCard,
     shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
   ),
+  searchBarTheme: SearchBarThemeData(
+    elevation: WidgetStatePropertyAll(0),
+    backgroundColor: WidgetStatePropertyAll(kSurfaceCard),
+    shape: WidgetStatePropertyAll(RoundedRectangleBorder(
+      borderRadius: BorderRadius.circular(28),
+      side: BorderSide(color: kDivider),
+    )),
+    padding: WidgetStatePropertyAll(EdgeInsets.symmetric(horizontal: 8)),
+    textStyle: WidgetStatePropertyAll(GoogleFonts.inter(fontSize: 14, color: kTextPrimary)),
+    hintStyle: WidgetStatePropertyAll(GoogleFonts.inter(fontSize: 14, color: kTextSecondary)),
+  ),
 );
 
 final ThemeData ynabDarkTheme = ThemeData(