refactor(editor): get loading icon with theme (#12079)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced a unified loading spinner icon that adapts to light or dark themes automatically.

- **Refactor**
  - Streamlined loading icon usage across the app by replacing multiple theme-based icons with a single helper function for consistent and simplified icon management.

- **Chores**
  - Removed an unused dependency to improve package management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/i18n/src/i18n-completenesses.json

@@ -5,7 +5,7 @@
   "de": 98,
   "el-GR": 98,
   "en": 100,
-  "es-AR": 99,
+  "es-AR": 98,
   "es-CL": 100,
   "es": 98,
   "fa": 98,