feat: add delete buttons for categories and tags in combobox dropdown

- Add onDelete prop to ColoredItemCombobox with X button per item
- Wire up deleteCategory/deleteTag API calls in AdminNewsCreate
- Auto-clear selection if the deleted item was selected
- Spinner on delete, haptic feedback, i18n aria-label

src/locales/en.json

@@ -4522,7 +4522,8 @@
         "searchOrCreate": "Search or create...",
         "noItems": "Nothing found",
         "placeholder": "Select...",
-        "clear": "Clear"
+        "clear": "Clear",
+        "delete": "Delete {{name}}"
       },
       "toolbar": {
         "bold": "Bold",