added push notifications

frontend/screens/SubscribedFeed.tsx

@@ -9,6 +9,7 @@ import SearchBar from "../components/SearchBar";
 import ExpandableItem from "../components/ExpandableItem";
 import { useAuth } from "../context/AuthContext";
 import { Entry, entriesApi } from "../services/api";
+import {useFocusEffect} from "expo-router";
 
 type SortMode = "time" | "subject";
 
@@ -124,9 +125,14 @@ export default function SubscribedFeed() {
         } finally {
             setLoading(false);
         }
-    }, [user?.subscribedSubjectIds]);
+    }, [user?.subscribedSubjectIds?.join(',')]);
 
-    useEffect(() => { fetchFeed(); }, [fetchFeed]);
+    // Always re-fetch when tab gains focus
+    useFocusEffect(
+        useCallback(() => {
+            fetchFeed();
+        }, [fetchFeed])
+    );
 
     // Filter then group
     const filtered = useMemo(() => {
@@ -249,7 +255,7 @@ export default function SubscribedFeed() {
                         <View className="items-center mt-16 px-8">
                             <Text className="text-4xl mb-3">🔍</Text>
                             <Text className={`text-base font-sans font-semibold text-center ${dark ? "text-ink-dark" : "text-ink-light"}`}>
-                                No results for "{query}"
+                                No results for &#34;{query}&#34;
                             </Text>
                         </View>
                     ) : (