feat: Introduce category selection functionality in NoteEditorScreen and related components

lib/widgets/category_style.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+
+class CategoryStyle {
+  CategoryStyle._();
+
+  static const List<Color> colors = <Color>[
+    Colors.amber,
+    Colors.blue,
+    Colors.green,
+    Colors.purple,
+    Colors.red,
+    Colors.teal,
+    Colors.orange,
+    Colors.grey,
+  ];
+
+  static const List<IconData> icons = <IconData>[
+    Icons.folder,
+    Icons.work,
+    Icons.star,
+    Icons.home,
+    Icons.school,
+    Icons.book,
+    Icons.music_note,
+    Icons.lightbulb,
+  ];
+
+  static IconData iconForCodePoint(int? codePoint) {
+    if (codePoint == null) {
+      return Icons.folder_outlined;
+    }
+
+    for (final IconData icon in icons) {
+      if (icon.codePoint == codePoint) {
+        return icon;
+      }
+    }
+
+    return Icons.folder_outlined;
+  }
+}

lib/widgets/menu_drawer.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:notas/models/category.dart';
+import 'package:notas/widgets/category_style.dart';
 
 class MenuDrawer extends StatelessWidget {
   const MenuDrawer({
@@ -45,9 +46,10 @@ class MenuDrawer extends StatelessWidget {
                       child: Column(
                         children: categories.map((category) {
                           final categoryId = 'category_${category.id}';
-                          final IconData categoryIcon = _iconForCodePoint(
-                            category.iconCodePoint,
-                          );
+                          final IconData categoryIcon =
+                              CategoryStyle.iconForCodePoint(
+                                category.iconCodePoint,
+                              );
                           
                           return _MenuItemTile(
                             icon: categoryIcon,
@@ -105,31 +107,6 @@ class MenuDrawer extends StatelessWidget {
   }
 }
 
-IconData _iconForCodePoint(int? codePoint) {
-  if (codePoint == null) {
-    return Icons.folder_outlined;
-  }
-
-  const List<IconData> icons = [
-    Icons.folder,
-    Icons.work,
-    Icons.star,
-    Icons.home,
-    Icons.school,
-    Icons.book,
-    Icons.music_note,
-    Icons.lightbulb,
-  ];
-
-  for (final IconData icon in icons) {
-    if (icon.codePoint == codePoint) {
-      return icon;
-    }
-  }
-
-  return Icons.folder_outlined;
-}
-
 class _MenuItemTile extends StatefulWidget {
   const _MenuItemTile({
     required this.icon,