budget: icones carrées tonal (secondaryContainer)

lib/app.dart

@@ -94,13 +94,16 @@ class _YnabAppState extends ConsumerState<YnabApp> {
                   ),
                 ),
                 const SizedBox(height: 12),
-                DropdownButtonFormField<int>(
-                  value: accountId,
-                  decoration: const InputDecoration(labelText: 'Compte'),
-                  items: accounts
-                      .map((a) => DropdownMenuItem(value: a.id, child: Text(a.name)))
+                DropdownMenu<int>(
+                  initialSelection: accountId,
+                  label: const Text('Compte'),
+                  expandedInsets: EdgeInsets.zero,
+                  dropdownMenuEntries: accounts
+                      .map((a) => DropdownMenuEntry(value: a.id, label: a.name))
                       .toList(),
-                  onChanged: (v) => accountId = v,
+                  onSelected: (v) {
+                    if (v != null) accountId = v;
+                  },
                 ),
               ],
             ),

lib/screens/accounts_screen.dart

@@ -97,16 +97,18 @@ class _AccountCard extends ConsumerWidget {
                   keyboardType: const TextInputType.numberWithOptions(decimal: true),
                 ),
                 const SizedBox(height: 12),
-                DropdownButtonFormField<String>(
-                  initialValue: type,
-                  decoration: const InputDecoration(labelText: 'Type'),
-                  items: const [
-                    DropdownMenuItem(value: 'checking', child: Text('Compte courant')),
-                    DropdownMenuItem(value: 'savings', child: Text('Épargne')),
-                    DropdownMenuItem(value: 'credit', child: Text('Carte de crédit')),
-                    DropdownMenuItem(value: 'cash', child: Text('Espèces')),
+                DropdownMenu<String>(
+                  initialSelection: type,
+                  label: const Text('Type'),
+                  enableSearch: false,
+                  expandedInsets: EdgeInsets.zero,
+                  dropdownMenuEntries: const [
+                    DropdownMenuEntry(value: 'checking', label: 'Compte courant'),
+                    DropdownMenuEntry(value: 'savings', label: 'Épargne'),
+                    DropdownMenuEntry(value: 'credit', label: 'Carte de crédit'),
+                    DropdownMenuEntry(value: 'cash', label: 'Espèces'),
                   ],
-                  onChanged: (v) {
+                  onSelected: (v) {
                     if (v != null) {
                       type = v;
                       setDialogState(() {});

lib/screens/budget_screen.dart

@@ -176,10 +176,18 @@ class _CategoryRow extends ConsumerWidget {
               dense: true,
               contentPadding: EdgeInsets.zero,
               visualDensity: VisualDensity.compact,
-              leading: Icon(
-                categoryIcon(category.icon),
-                size: 22,
-                color: Theme.of(context).colorScheme.onSurfaceVariant,
+              leading: Container(
+                width: 36,
+                height: 36,
+                decoration: BoxDecoration(
+                  color: Theme.of(context).colorScheme.secondaryContainer,
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Icon(
+                  categoryIcon(category.icon),
+                  size: 18,
+                  color: Theme.of(context).colorScheme.onSecondaryContainer,
+                ),
               ),
               title: Text(category.name, style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600)),
               trailing: Text(