Enhance map functionality and API documentation

- Updated API documentation for the `rebuildZooms` endpoint to clarify its long execution time and response behavior.
- Modified MapView component to manage tile cache invalidation after rebuilding zoom levels, ensuring fresh tile display.
- Introduced a new composable for handling tile cache invalidation state after admin actions.
- Enhanced character icon creation to reflect ownership status with distinct colors.
- Improved loading state handling in various components for better user experience during data fetching.

frontend-nuxt/components/map/MapControlsContent.vue

@@ -56,7 +56,12 @@
         Display
       </h3>
       <label class="label cursor-pointer justify-start gap-2 py-0 hover:bg-base-200/50 rounded-lg px-2 -mx-2 touch-manipulation" :class="touchFriendly ? 'min-h-11' : ''">
-        <input v-model="showGridCoordinates" type="checkbox" class="checkbox checkbox-sm" />
+        <input
+          v-model="showGridCoordinates"
+          type="checkbox"
+          class="checkbox checkbox-sm"
+          data-testid="show-grid-coordinates"
+        />
         <span>Show grid coordinates</span>
       </label>
       <label class="label cursor-pointer justify-start gap-2 py-0 hover:bg-base-200/50 rounded-lg px-2 -mx-2 touch-manipulation" :class="touchFriendly ? 'min-h-11' : ''">