Refine map tile updates and enhance performance

- Updated tile freshness animation to reduce flicker and improve visual clarity.
- Modified MapView component to optimize layer visibility handling and ensure proper map resizing on fullscreen toggle.
- Increased tile buffer size in map initialization for better tile loading efficiency.
- Implemented logic to limit tile updates to only visible tiles, enhancing rendering performance during map updates.

frontend-nuxt/assets/css/leaflet-overrides.css

@@ -9,17 +9,15 @@
   visibility: visible !important;
 }
 
-/* Brief highlight when a tile is updated via SSE (tile freshness indicator). */
+/* Subtle highlight when a tile is updated via SSE (reduced intensity to limit flicker). */
 @keyframes tile-fresh-glow {
   0% {
-    filter: brightness(1.15);
-    box-shadow: 0 0 0 0 oklch(0.6 0.2 264 / 0.4);
+    opacity: 0.92;
   }
   100% {
-    filter: brightness(1);
-    box-shadow: none;
+    opacity: 1;
   }
 }
 .leaflet-tile.tile-fresh {
-  animation: tile-fresh-glow 0.6s ease-out;
+  animation: tile-fresh-glow 0.4s ease-out;
 }