chore: fix crash gps

frontend-admin/src/screens/delivery/DashboardScreen.tsx

@@ -281,17 +281,44 @@ export default function DashboardScreen() {
     // --------------------------------------------------
     // Location tracking
     // --------------------------------------------------
+    const sendingRef = useRef(false);
+
     const sendCurrentLocation = useCallback(async () => {
+        if (sendingRef.current) return;
+        sendingRef.current = true;
+
         try {
-            const loc = await Location.getCurrentPositionAsync({
+            const loc = await Promise.race([
-                accuracy: Location.Accuracy.High,
+                Location.getCurrentPositionAsync({
-            });
+                    accuracy: Location.Accuracy.High,
-            const { latitude, longitude } = loc.coords;
+                }),
+                new Promise<never>((_, reject) =>
+                    setTimeout(() => reject(new Error("GPS timeout")), 8000),
+                ),
+            ]);
+
+            // validation runtime + typage TS
+            if (
+                !loc ||
+                typeof loc !== "object" ||
+                !("coords" in loc) ||
+                !loc.coords
+            ) {
+                console.log("GPS invalide — update ignoré");
+                return;
+            }
+
+            const coords = (loc as Location.LocationObject).coords;
+            const { latitude, longitude } = coords;
+
             setLastCoords({ lat: latitude, lng: longitude });
             setLastUpdate(new Date());
+
             await updateMyLocation(latitude, longitude);
-        } catch {
+        } catch (err) {
-            /* silent */
+            console.log("GPS error:", err);
+        } finally {
+            sendingRef.current = false;
         }
     }, []);