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/adapter/daemon.ts

@@ -0,0 +1,76 @@
+import type { IpcMessage } from '../types'
+
+type Listener = (msg: IpcMessage) => void
+
+// DaemonAdapter connects to a locally-running waste daemon over WebSocket IPC.
+// The daemon must have WS IPC enabled (--ws-port flag).
+export class DaemonAdapter {
+  private ws: WebSocket | null = null
+  private listeners: Listener[] = []
+  private url: string
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null
+
+  status: 'disconnected' | 'connecting' | 'connected' = 'disconnected'
+  onStatusChange?: (s: DaemonAdapter['status']) => void
+
+  constructor(url: string) {
+    this.url = url
+  }
+
+  connect() {
+    if (this.ws) return
+    this.setStatus('connecting')
+
+    const ws = new WebSocket(this.url)
+    this.ws = ws
+
+    ws.onopen = () => {
+      this.setStatus('connected')
+    }
+
+    ws.onmessage = (ev) => {
+      try {
+        const msg: IpcMessage = JSON.parse(ev.data)
+        this.listeners.forEach(l => l(msg))
+      } catch {
+        // ignore malformed frames
+      }
+    }
+
+    ws.onclose = () => {
+      this.ws = null
+      this.setStatus('disconnected')
+      // Reconnect after 2s
+      this.reconnectTimer = setTimeout(() => this.connect(), 2000)
+    }
+
+    ws.onerror = () => {
+      ws.close()
+    }
+  }
+
+  disconnect() {
+    if (this.reconnectTimer) clearTimeout(this.reconnectTimer)
+    this.ws?.close()
+    this.ws = null
+    this.setStatus('disconnected')
+  }
+
+  send(msg: IpcMessage) {
+    if (this.ws?.readyState === WebSocket.OPEN) {
+      this.ws.send(JSON.stringify(msg))
+    }
+  }
+
+  on(listener: Listener) {
+    this.listeners.push(listener)
+    return () => {
+      this.listeners = this.listeners.filter(l => l !== listener)
+    }
+  }
+
+  private setStatus(s: DaemonAdapter['status']) {
+    this.status = s
+    this.onStatusChange?.(s)
+  }
+}