fix(mobile): also ping last_active_at on initial app open

packages/mobile/src/hooks/useActivityPing.ts

@@ -1,4 +1,4 @@
-import { useCallback } from 'react'
+import { useCallback, useEffect } from 'react'
 
 import { useCurrentUserId, useQueryContext } from '@audius/common/api'
 
@@ -9,18 +9,24 @@ export const useActivityPing = () => {
   const { data: currentUserId } = useCurrentUserId()
   const { audiusSdk } = useQueryContext()
 
-  useEnterForeground(
-    useCallback(async () => {
-      if (!currentUserId) return
-      try {
-        const sdk = await audiusSdk()
-        await audiusBackendInstance.pingActivity({
-          sdk,
-          userId: currentUserId
-        })
-      } catch {
-        // Fire-and-forget
-      }
-    }, [currentUserId, audiusSdk])
-  )
+  const pingActivity = useCallback(async () => {
+    if (!currentUserId) return
+    try {
+      const sdk = await audiusSdk()
+      await audiusBackendInstance.pingActivity({
+        sdk,
+        userId: currentUserId
+      })
+    } catch {
+      // Fire-and-forget
+    }
+  }, [currentUserId, audiusSdk])
+
+  // Ping on initial app open (AppState starts as 'active' with no transition)
+  useEffect(() => {
+    pingActivity()
+  }, [pingActivity])
+
+  // Ping on subsequent foreground transitions
+  useEnterForeground(pingActivity)
 }