feat: Add category deletion functionality and enhance category dialog for editing

lib/data/note_repository.dart

@@ -85,6 +85,10 @@ class NoteRepository {
     debugPrint('Category inserted to database');
   }
 
+  Future<void> deleteCategory(String id) async {
+    await _database.deleteCategory(id);
+  }
+
   Future<Note> createNote(Note note) async {
     await _database.insertNoteAtTop(
       NotesCompanion.insert(

lib/screens/home_screen.dart

@@ -291,9 +291,11 @@ class _HomeScreenState extends State<HomeScreen> {
     }
   }
 
-  Future<void> _showCreateCategoryDialog() async {
+  Future<void> _showCreateCategoryDialog([Category? category]) async {
-    final TextEditingController controller = TextEditingController();
+    final TextEditingController controller = TextEditingController(text: category?.name ?? '');
-    Color? selectedColor;
+    Color? selectedColor = category != null && category.colorValue != null
+        ? Color(category.colorValue!)
+        : null;
     IconData? selectedIcon;
 
     final List<Color> palette = [
@@ -318,13 +320,20 @@ class _HomeScreenState extends State<HomeScreen> {
       Icons.lightbulb,
     ];
 
+    if (category != null && category.iconCodePoint != null) {
+      selectedIcon = icons.firstWhere(
+        (i) => i.codePoint == category.iconCodePoint,
+        orElse: () => icons.first,
+      );
+    }
+
     final bool? result = await showDialog<bool>(
       context: context,
       builder: (BuildContext context) {
         return StatefulBuilder(
           builder: (BuildContext ctx, StateSetter setState) {
             return AlertDialog(
-              title: const Text('Crear categoría'),
+              title: Text(category == null ? 'Crear categoría' : 'Editar categoría'),
               content: SingleChildScrollView(
                 child: Column(
                   mainAxisSize: MainAxisSize.min,
@@ -406,13 +415,46 @@ class _HomeScreenState extends State<HomeScreen> {
                 ),
               ),
               actions: [
+                if (category != null)
+                  TextButton(
+                    onPressed: () async {
+                      final bool? confirm = await showDialog<bool>(
+                        context: context,
+                        builder: (context) => AlertDialog(
+                          title: const Text('Borrar categoría'),
+                          content: const Text('¿Seguro que quieres borrar esta categoría?'),
+                          actions: [
+                            TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('Cancelar')),
+                            TextButton(onPressed: () => Navigator.pop(context, true), child: const Text('Borrar')),
+                          ],
+                        ),
+                      );
+
+                      if (confirm == true) {
+                        try {
+                          await widget.repository.deleteCategory(category.id);
+                          await _loadCategories();
+                          if (mounted) {
+                            ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Categoría borrada')));
+                          }
+                          try {
+                            await widget.onRequestSync();
+                          } catch (_) {}
+                        } catch (e) {
+                          if (mounted) ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Error al borrar categoría: $e')));
+                        }
+                        Navigator.pop(context, false);
+                      }
+                    },
+                    child: const Text('Borrar', style: TextStyle(color: Colors.red)),
+                  ),
                 TextButton(
                   onPressed: () => Navigator.pop(context, false),
                   child: const Text('Cancelar'),
                 ),
                 TextButton(
                   onPressed: () => Navigator.pop(context, true),
-                  child: const Text('Crear'),
+                  child: Text(category == null ? 'Crear' : 'Guardar'),
                 ),
               ],
             );
@@ -428,19 +470,20 @@ class _HomeScreenState extends State<HomeScreen> {
 
     try {
       final Category newCategory = Category(
+        id: category?.id,
         name: controller.text.trim(),
         updatedAt: DateTime.now(),
         colorValue: selectedColor?.toARGB32(),
         iconCodePoint: selectedIcon?.codePoint,
       );
+      if (category == null) {
         debugPrint('Creating category: ${newCategory.name}, color: ${newCategory.colorValue}, icon: ${newCategory.iconCodePoint}');
+      } else {
+        debugPrint('Updating category: ${newCategory.name}, color: ${newCategory.colorValue}, icon: ${newCategory.iconCodePoint}');
+      }
       await widget.repository.createCategory(newCategory);
       await _loadCategories();
-      if (mounted) {
+
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(const SnackBar(content: Text('Categoría creada')));
-      }
       try {
         await widget.onRequestSync();
       } catch (_) {}
@@ -876,6 +919,7 @@ class _HomeScreenState extends State<HomeScreen> {
                                       ? 'deleted_notes'
                                       : 'all_notes'),
                             categories: _categories,
+                            onEditCategory: (Category c) => _showCreateCategoryDialog(c),
                             onCreateCategory: _showCreateCategoryDialog,
                           ),
                         ),

lib/widgets/menu_drawer.dart

@@ -8,12 +8,14 @@ class MenuDrawer extends StatelessWidget {
     this.selectedItem,
     this.categories = const [],
     this.onCreateCategory,
+    this.onEditCategory,
   });
 
   final ValueChanged<String>? onMenuItemTapped;
   final String? selectedItem;
   final List<Category> categories;
   final VoidCallback? onCreateCategory;
+  final ValueChanged<Category>? onEditCategory;
 
   @override
   Widget build(BuildContext context) {
@@ -57,6 +59,15 @@ class MenuDrawer extends StatelessWidget {
                             onTap: () => onMenuItemTapped?.call(categoryId),
                             iconColor: Color(category.colorValue ?? 0xFFFFC107),
                             textColor: Color(category.colorValue ?? 0xFFFFC107),
+                            trailing: selectedItem == categoryId
+                                ? IconButton(
+                                    icon: const Icon(
+                                      Icons.more_vert,
+                                      color: Colors.white70,
+                                    ),
+                                    onPressed: () => onEditCategory?.call(category),
+                                  )
+                                : null,
                           );
                         }).toList(),
                       ),
@@ -99,6 +110,7 @@ class _MenuItemTile extends StatelessWidget {
     this.onTap,
     this.iconColor,
     this.textColor,
+    this.trailing,
   });
 
   final IconData icon;
@@ -107,6 +119,7 @@ class _MenuItemTile extends StatelessWidget {
   final VoidCallback? onTap;
   final Color? iconColor;
   final Color? textColor;
+  final Widget? trailing;
 
   @override
   Widget build(BuildContext context) {
@@ -134,6 +147,7 @@ class _MenuItemTile extends StatelessWidget {
       ),
       child: ListTile(
         leading: Icon(icon, color: iconColor ?? foregroundColor),
+        trailing: trailing,
         title: Text(
           label,
           style: TextStyle(color: textColor ?? foregroundColor, fontSize: 14),