Add retry-on-empty for followers, articles, and hashtag feeds

Same pattern as profile notes and notifications: if the first relay
fetch returns empty, wait 3s and retry once. Prevents false "No X
found" messages when relays are slow to connect.

src/components/feed/HashtagFeed.tsx

@@ -13,11 +13,22 @@ export function HashtagFeed() {
 
   useEffect(() => {
     if (!tag) return;
+    let cancelled = false;
     setLoading(true);
     setNotes([]);
-    fetchHashtagFeed(tag)
-      .then(setNotes)
-      .finally(() => setLoading(false));
+    (async () => {
+      let result = await fetchHashtagFeed(tag).catch(() => [] as NDKEvent[]);
+      if (result.length === 0 && !cancelled) {
+        await new Promise((r) => setTimeout(r, 3000));
+        if (cancelled) return;
+        result = await fetchHashtagFeed(tag).catch(() => [] as NDKEvent[]);
+      }
+      if (!cancelled) {
+        setNotes(result);
+        setLoading(false);
+      }
+    })();
+    return () => { cancelled = true; };
   }, [tag]);
 
   return (

src/components/follows/FollowsView.tsx

@@ -103,7 +103,13 @@ export function FollowsView() {
     (async () => {
       try {
         await ensureConnected();
-        const result = await fetchFollowers(pubkey);
+        let result = await fetchFollowers(pubkey);
+        // Retry once if empty — relays may not be ready yet
+        if (result.length === 0) {
+          await new Promise((r) => setTimeout(r, 3000));
+          if (cancelled) return;
+          result = await fetchFollowers(pubkey);
+        }
         if (!cancelled) {
           setFollowers(result);
           setFollowersFetched(true);

src/components/profile/ProfileView.tsx

@@ -116,8 +116,21 @@ export function ProfileView() {
 
   useEffect(() => {
     if (profileTab !== "articles" || articles.length > 0) return;
+    let cancelled = false;
     setArticlesLoading(true);
-    fetchAuthorArticles(pubkey).then(setArticles).catch(() => setArticles([])).finally(() => setArticlesLoading(false));
+    (async () => {
+      let result = await fetchAuthorArticles(pubkey).catch(() => [] as typeof articles);
+      if (result.length === 0 && !cancelled) {
+        await new Promise((r) => setTimeout(r, 3000));
+        if (cancelled) return;
+        result = await fetchAuthorArticles(pubkey).catch(() => [] as typeof articles);
+      }
+      if (!cancelled) {
+        setArticles(result);
+        setArticlesLoading(false);
+      }
+    })();
+    return () => { cancelled = true; };
   }, [profileTab, pubkey]);
 
   return (