feat: standalone web UI (React + Vite)

React + TypeScript UI on port 5274. Connects to local daemon via
WebSocket IPC (DaemonAdapter). Full chat layout with sidebar, message
pane, and peer list. Mirrors the TUI feature set.

- src/types.ts        — IPC types mirroring proto.go
- src/adapter/daemon  — WebSocket IPC adapter with auto-reconnect
- src/store/index.ts  — Zustand store; handles all daemon events
- src/pages/          — Onboarding (connect + join) and Chat
- src/components/     — Sidebar, MessagePane, PeerList

Dev: cd web && npm run dev  (port 5274)
Build: cd web && npm run build

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

web/src/components/PeerList.tsx

@@ -0,0 +1,35 @@
+import { useWaste } from '../store'
+
+export function PeerList() {
+  const { connectedPeers, activeNetworkId, setActiveRoom, send } = useWaste()
+
+  function openDM(peerId: string) {
+    const room = `dm:${peerId}`
+    setActiveRoom(room)
+  }
+
+  function requestFiles(peerId: string) {
+    send({ type: 'get_file_list', network_id: activeNetworkId ?? undefined, peer_id: peerId })
+  }
+
+  return (
+    <aside className="peer-list">
+      <span className="sidebar-label">Peers ({connectedPeers.length})</span>
+      {connectedPeers.map(p => (
+        <div key={p.id} className="peer-entry">
+          <div className="peer-entry-info">
+            <span className="alias">{p.alias}</span>
+            <span className="peer-id">{p.id.slice(0, 8)}…</span>
+          </div>
+          <div className="peer-entry-actions">
+            <button onClick={() => openDM(p.id)} title="Direct message">DM</button>
+            <button onClick={() => requestFiles(p.id)} title="Browse files">Files</button>
+          </div>
+        </div>
+      ))}
+      {connectedPeers.length === 0 && (
+        <p className="empty">No peers connected yet</p>
+      )}
+    </aside>
+  )
+}