Compose, reactions, replies + feed filtering

- Add ComposeBox with Ctrl+Enter shortcut and char limit
- Add reply/like actions to NoteCard with inline reply box
- Add publishNote, publishReaction, publishReply to nostr lib
- Filter bot JSON blobs from feed (content starting with { or [)
- Fix sidebar login button always visible (shrink-0 + nav overflow)
- Restore pubkey sessions from localStorage on startup
- Add CLAUDE.md with project guidance
- Add thread view and onboarding notes to AGENTS.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main.tsx

@@ -2,6 +2,16 @@ import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import App from "./App";
 import "./index.css";
+import { useUserStore } from "./stores/user";
+
+// Restore session from localStorage
+const savedPubkey = localStorage.getItem("wrystr_pubkey");
+const savedLoginType = localStorage.getItem("wrystr_login_type");
+if (savedPubkey && savedLoginType === "pubkey") {
+  useUserStore.getState().loginWithPubkey(savedPubkey);
+}
+// Note: nsec is never stored, so nsec sessions can't be auto-restored.
+// Future: restore via OS keychain.
 
 createRoot(document.getElementById("root") as HTMLElement).render(
   <StrictMode>