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/store/index.ts

@@ -1,10 +1,14 @@
 import { create } from 'zustand'
 import type { PeerInfo, NetworkInfo, ChatMessage, FileEntry, IpcMessage } from '../types'
 import { DaemonAdapter } from '../adapter/daemon'
+import { BrowserAdapter } from '../adapter/browser'
+
+type AnyAdapter = DaemonAdapter | BrowserAdapter
 
 interface WasteState {
   // connection
-  adapter: DaemonAdapter | null
+  adapter: AnyAdapter | null
+  adapterMode: 'daemon' | 'browser' | null
   daemonStatus: 'disconnected' | 'connecting' | 'connected'
 
   // identity
@@ -31,6 +35,7 @@ interface WasteState {
 
   // actions
   connect: (url: string) => void
+  connectBrowser: () => void
   disconnect: () => void
   send: (msg: IpcMessage) => void
   setActiveNetwork: (id: string) => void
@@ -40,6 +45,7 @@ interface WasteState {
 
 export const useWaste = create<WasteState>((set, get) => ({
   adapter: null,
+  adapterMode: null,
   daemonStatus: 'disconnected',
   masterAlias: null,
   masterId: null,
@@ -57,12 +63,22 @@ export const useWaste = create<WasteState>((set, get) => ({
     adapter.onStatusChange = (s) => set({ daemonStatus: s })
     adapter.on((msg) => get().handleEvent(msg))
     adapter.connect()
-    set({ adapter })
+    set({ adapter, adapterMode: 'daemon' })
+  },
+
+  connectBrowser() {
+    const adapter = new BrowserAdapter()
+    adapter.onStatusChange = (s) => set({ daemonStatus: s })
+    adapter.on((msg) => get().handleEvent(msg))
+    adapter.connect()
+    set({ adapter, adapterMode: 'browser' })
   },
 
   disconnect() {
-    get().adapter?.disconnect()
-    set({ adapter: null, daemonStatus: 'disconnected' })
+    const a = get().adapter
+    if (a instanceof DaemonAdapter) a.disconnect()
+    else if (a instanceof BrowserAdapter) a.disconnect()
+    set({ adapter: null, adapterMode: null, daemonStatus: 'disconnected' })
   },
 
   send(msg) {
@@ -93,11 +109,13 @@ export const useWaste = create<WasteState>((set, get) => ({
       }
       case 'network_joined': {
         set(s => ({
+          localPeer: s.localPeer ?? msg.local_peer ?? null,
           networks: s.networks.some(n => n.network_id === msg.network_id)
             ? s.networks
             : [...s.networks, {
                 network_id: msg.network_id!,
                 network_name: msg.network_name!,
+                local_peer: msg.local_peer,
                 share_dir: msg.share_dir,
               }],
           activeNetworkId: s.activeNetworkId ?? msg.network_id!,