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/pages/admin/users/[username].vue

@@ -30,7 +30,10 @@
       </div>
       <p v-if="error" class="text-error text-sm">{{ error }}</p>
       <div class="flex gap-2">
-        <button type="submit" class="btn btn-primary" :disabled="loading">{{ loading ? '…' : 'Save' }}</button>
+        <button type="submit" class="btn btn-primary" :disabled="loading">
+          <span v-if="loading" class="loading loading-spinner loading-sm" />
+          <span v-else>Save</span>
+        </button>
         <NuxtLink to="/admin" class="btn btn-ghost">Back</NuxtLink>
         <button
           v-if="!isNew"