feat(home): refresh data on app foreground

adds a hook that refetches home data when the app
returns to the foreground or starts from a cold start.

this ensures the home screen always displays the
most up-to-date content.

hooks/useRefetchHomeOnForeground.ts

@@ -0,0 +1,32 @@
+import { useQueryClient } from "@tanstack/react-query";
+import { useEffect } from "react";
+import { AppState } from "react-native";
+
+/**
+ * Refetches active home queries on mount (cold start) and whenever
+ * the app returns to the foreground from background.
+ */
+export function useRefetchHomeOnForeground() {
+  const queryClient = useQueryClient();
+
+  useEffect(() => {
+    // On mount (cold start), use cancelRefetch: false so we don't cancel
+    // an in-flight initial fetch that React Query already started.
+    queryClient.refetchQueries(
+      { queryKey: ["home"], type: "active" },
+      { cancelRefetch: false },
+    );
+
+    const subscription = AppState.addEventListener("change", (state) => {
+      if (state === "active") {
+        // On foreground return, force a fresh refetch
+        queryClient.refetchQueries(
+          { queryKey: ["home"], type: "active" },
+          { cancelRefetch: true },
+        );
+      }
+    });
+
+    return () => subscription.remove();
+  }, [queryClient]);
+}