Promote dev → uat: GRO-2160 route nav export + offline polish (#67)

vite.config.ts

@@ -57,6 +57,23 @@ export default defineConfig({
               },
             },
           },
+          {
+            // OpenStreetMap raster tiles for the Route Planner map. CacheFirst so
+            // tiles pre-warmed for a route render offline during the day. Capped
+            // entries + 7-day TTL keep the cache bounded.
+            urlPattern: /^https:\/\/[abc]\.tile\.openstreetmap\.org\/.*\.png$/i,
+            handler: "CacheFirst",
+            options: {
+              cacheName: "osm-tiles",
+              expiration: {
+                maxEntries: 400,
+                maxAgeSeconds: 60 * 60 * 24 * 7, // 7 days
+              },
+              cacheableResponse: {
+                statuses: [0, 200],
+              },
+            },
+          },
         ],
       },
     }),