get front end to work

backend/src/services/cache.rs

@@ -1,20 +1,29 @@
 use redis::AsyncCommands;
 use sha2::{Digest, Sha256};
+use tokio::sync::OnceCell;
 
 /// Redis caching layer implementing the key patterns and TTLs
 /// defined in DATA_MODEL.md section 3.
 pub struct CacheService {
     client: redis::Client,
+    conn: OnceCell<redis::aio::MultiplexedConnection>,
 }
 
 impl CacheService {
     pub fn new(redis_url: &str) -> Result<Self, redis::RedisError> {
         let client = redis::Client::open(redis_url)?;
-        Ok(Self { client })
+        Ok(Self {
+            client,
+            conn: OnceCell::new(),
+        })
     }
 
     async fn conn(&self) -> Result<redis::aio::MultiplexedConnection, redis::RedisError> {
-        self.client.get_multiplexed_async_connection().await
+        let conn = self
+            .conn
+            .get_or_try_init(|| self.client.get_multiplexed_async_connection())
+            .await?;
+        Ok(conn.clone())
     }
 
     // ── Tile cache ──────────────────────────────────────────────

mobile/android/app/src/main/AndroidManifest.xml

@@ -29,7 +29,7 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-        <!-- Disable Impeller/Vulkan — fallback to Skia/OpenGL for devices with poor Vulkan support -->
+        <!-- Disable Impeller/Vulkan — vector_map_tiles canvas ops are incompatible with Impeller -->
         <meta-data
             android:name="io.flutter.embedding.android.EnableImpeller"
             android:value="false" />

mobile/lib/features/map/presentation/screens/map_screen.dart

@@ -23,6 +23,9 @@ class _MapScreenState extends ConsumerState<MapScreen> {
   void initState() {
     super.initState();
     _mapController = MapController();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      ref.read(mapProvider.notifier).locateUser();
+    });
   }
 
   @override
@@ -50,6 +53,7 @@ class _MapScreenState extends ConsumerState<MapScreen> {
           FlutterMap(
             mapController: _mapController,
             options: MapOptions(
+              backgroundColor: Colors.transparent,
               initialCenter: mapState.center,
               initialZoom: mapState.zoom,
               minZoom: 0,