feat(watch): add lap detection via accelerometer and workout sync to phone

src/features/watch-connectivity/hooks/useWatchWorkoutSync.ts

@@ -0,0 +1,36 @@
+import { useEffect, useRef } from "react";
+import WatchConnectivity from "../../../modules/watch-connectivity";
+import { saveWatchCompletedWorkout } from "@db/operations";
+
+export function useWatchWorkoutSync() {
+  const pollingRef = useRef<ReturnType<typeof setInterval> | null>(null);
+
+  useEffect(() => {
+    pollingRef.current = setInterval(async () => {
+      try {
+        const events = (await WatchConnectivity.pollEvents()) as any[];
+        for (const event of events) {
+          if (event.type === "workoutCompleted") {
+            console.log("[useWatchWorkoutSync] Received workoutCompleted:", event.workoutId);
+            await saveWatchCompletedWorkout({
+              workoutId: event.workoutId,
+              duration: event.duration ?? 0,
+              totalDistance: event.totalDistance ?? 0,
+              calories: event.calories ?? 0,
+              laps: event.laps ?? [],
+            });
+            console.log("[useWatchWorkoutSync] Saved completed workout to DB");
+          }
+        }
+      } catch (error) {
+        // Silently ignore polling errors
+      }
+    }, 2000);
+
+    return () => {
+      if (pollingRef.current) {
+        clearInterval(pollingRef.current);
+      }
+    };
+  }, []);
+}