MVP: Go daemon, password auth, persistent PTY terminals, React/xterm UI, PWA

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/App.tsx

@@ -0,0 +1,23 @@
+import { useCallback, useEffect, useState } from 'react'
+import { api, Me, Unauthenticated } from './api'
+import Login from './Login'
+import Shell from './Shell'
+
+export default function App() {
+  const [me, setMe] = useState<Me | null | undefined>(undefined)
+
+  const refresh = useCallback(async () => {
+    try { setMe(await api.me()) } catch (e) { if (e instanceof Unauthenticated) setMe(null) }
+  }, [])
+
+  useEffect(() => { refresh() }, [refresh])
+  useEffect(() => {
+    if (!me) return
+    const t = setInterval(refresh, 30000)
+    return () => clearInterval(t)
+  }, [me, refresh])
+
+  if (me === undefined) return <div className="center muted">…</div>
+  if (me === null) return <Login onLogin={refresh} />
+  return <Shell me={me} onLoggedOut={() => setMe(null)} />
+}