Add live feed subscription, timeouts on all relay fetches

Global feed now uses a persistent live subscription (closeOnEose: false)
so new notes stream in real-time instead of requiring manual refresh.
Inspired by Wisp's streaming architecture.

Every fetchEvents call across the entire codebase now uses
fetchWithTimeout with groupable: false — prevents NDK from
batching/reusing stale subscriptions. This fixes Articles, DMs,
Notifications, Zaps, and Trending hanging indefinitely.

Also adds since filters on global (2h) and follow (24h) feeds
to ensure relay freshness, and fixes ArticleFeed re-fetch bug
where follows changes wiped latest tab results.

src/components/feed/NoteCard.tsx

@@ -6,7 +6,7 @@ import { useUserStore } from "../../stores/user";
 import { useMuteStore } from "../../stores/mute";
 import { useUIStore } from "../../stores/ui";
 import { timeAgo, shortenPubkey } from "../../lib/utils";
-import { getNDK, fetchNoteById } from "../../lib/nostr";
+import { getNDK, fetchNoteById, ensureConnected } from "../../lib/nostr";
 import { getParentEventId } from "../../lib/threadTree";
 import { NoteContent } from "./NoteContent";
 import { NoteActions, LoggedOutStats } from "./NoteActions";
@@ -132,6 +132,7 @@ export function NoteCard({ event, focused, onReplyInThread }: NoteCardProps) {
                       return;
                     }
                   }
+                  await ensureConnected();
                   const parent = await fetchNoteById(parentEventId);
                   if (parent) openThread(parent);
                 }}