Working feed: NDK + relay connection + live notes from Nostr

- Tailwind CSS + Zustand + NDK installed and configured
- Sidebar with feed/relays/settings navigation
- Global feed view with live notes from relays
- Profile fetching with caching and deduplication
- Relay connection with timeout handling
- Note cards with avatar, name, timestamp, content
- Dark theme, monospace, no-slop UI
- Devtools enabled for debugging

src/components/shared/SettingsView.tsx

@@ -0,0 +1,15 @@
+export function SettingsView() {
+  return (
+    <div className="h-full flex flex-col">
+      <header className="border-b border-border px-4 py-2.5 shrink-0">
+        <h1 className="text-text text-sm font-medium tracking-wide">Settings</h1>
+      </header>
+
+      <div className="flex-1 overflow-y-auto p-4">
+        <p className="text-text-dim text-[12px]">
+          Settings will appear here — key management, relay config, Lightning wallet connection, appearance.
+        </p>
+      </div>
+    </div>
+  );
+}