Enhance frontend UI and functionality

- Added page transition effects in app.vue for smoother navigation.
- Updated nuxt.config.ts to include custom font styles and page transitions.
- Improved loading indicators in MapPageWrapper.vue and login.vue for better user experience.
- Enhanced MapView.vue with a collapsible control panel and improved styling.
- Introduced new icons for various components to enhance visual consistency.
- Updated Tailwind CSS configuration to extend font families and improve theme management.
- Refined layout styles in default.vue and admin pages for better responsiveness and aesthetics.
- Implemented error handling and loading states across various forms for improved user feedback.

frontend-nuxt/app.vue

@@ -4,6 +4,17 @@
   </NuxtLayout>
 </template>
 
+<style>
+.page-enter-active,
+.page-leave-active {
+  transition: opacity 0.15s ease-out;
+}
+.page-enter-from,
+.page-leave-to {
+  opacity: 0;
+}
+</style>
+
 <script setup lang="ts">
 // Global error handling: on API auth failure, redirect to login
 const { onApiError } = useMapApi()