Add standalone browser mode: no daemon required

BrowserAdapter speaks yaw/2.1 signaling + WebRTC protocol entirely in
the browser (libsodium-wrappers for Ed25519/X25519). Identity stored in
localStorage; peers connect via any waste/yaw2 anchor.

When served from a non-localhost origin the app defaults to browser
mode. On localhost the daemon adapter is tried first with a one-click
switch to browser mode. config.js (gitignored, served by anchor) lets
the host pre-inject signalURL and other defaults.

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

web/src/App.tsx

@@ -4,15 +4,21 @@ import { Onboarding } from './pages/Onboarding'
 import { Chat } from './pages/Chat'
 import './App.css'
 
-// Default to local daemon WS IPC. Override with VITE_DAEMON_WS env var.
+// When served from the anchor (non-localhost), default to browser mode.
+// When running locally, try the daemon first.
+const isLocal = window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1'
 const DAEMON_WS = import.meta.env.VITE_DAEMON_WS ?? 'ws://127.0.0.1:17338'
 
 export default function App() {
-  const { connect, daemonStatus, localPeer } = useWaste()
+  const { connect, connectBrowser, daemonStatus, localPeer } = useWaste()
 
   useEffect(() => {
-    connect(DAEMON_WS)
-  }, [connect])
+    if (isLocal) {
+      connect(DAEMON_WS)
+    } else {
+      connectBrowser()
+    }
+  }, [connect, connectBrowser])
 
   if (daemonStatus !== 'connected' || !localPeer) {
     return <Onboarding status={daemonStatus} />