feat(category): add autocomplete for category inputs

lib/presentation/widgets/category_selector.dart

@@ -109,6 +109,8 @@ class CategorySelector extends ConsumerWidget {
     required VoidCallback onTap,
   }) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
+    final activeColor = isDark ? AppColors.darkPrimary : AppColors.lightPrimary;
+    final accentColor = isSelected ? activeColor : color;
 
     return Material(
       color: Colors.transparent,
@@ -120,13 +122,13 @@ class CategorySelector extends ConsumerWidget {
           padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
           decoration: BoxDecoration(
             color: isSelected
-                ? color.withOpacity(0.2)
+                ? accentColor.withOpacity(0.2)
                 : isDark
                 ? AppColors.darkSurface
                 : AppColors.lightBackground,
             borderRadius: BorderRadius.circular(20),
             border: Border.all(
-              color: isSelected ? color : Colors.transparent,
+              color: isSelected ? accentColor : Colors.transparent,
               width: 2,
             ),
           ),
@@ -137,7 +139,7 @@ class CategorySelector extends ConsumerWidget {
                 icon,
                 size: 20,
                 color: isSelected
-                    ? color
+                    ? accentColor
                     : isDark
                     ? AppColors.darkTextSecondary
                     : AppColors.lightTextSecondary,
@@ -147,7 +149,7 @@ class CategorySelector extends ConsumerWidget {
                 label,
                 style: TextStyle(
                   color: isSelected
-                      ? color
+                      ? accentColor
                       : isDark
                       ? AppColors.darkText
                       : AppColors.lightText,