feat(web): NetX workbench, UME-only UI, i18n, and header status

- Replace sidebar app with workbench home and module tabs (openOrFocusModule)

- Remove legacy pages; add module registry, shared tab channel, WEB.md

- Add zh/en i18n, global ToastProvider, restore oclaw bridge pill in header

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/utils/tabChannel.ts

@@ -0,0 +1,64 @@
+/** Shared cross-tab focus helpers (BroadcastChannel + sessionStorage ack). */
+
+export const TAB_FOCUS_DELAY_MS = 200;
+
+export function createFocusRequestId(prefix: string): string {
+  return `${prefix}-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
+}
+
+export function registerBroadcastListener<T extends { requestId: string }>(
+  channelName: string,
+  ackStorageKey: string,
+  onMessage: (data: T) => void,
+): () => void {
+  if (typeof BroadcastChannel === "undefined") {
+    return () => undefined;
+  }
+
+  const channel = new BroadcastChannel(channelName);
+  channel.onmessage = (ev: MessageEvent<T>) => {
+    const data = ev.data;
+    if (!data?.requestId) return;
+    try {
+      sessionStorage.setItem(ackStorageKey, data.requestId);
+    } catch {
+      /* ignore */
+    }
+    onMessage(data);
+  };
+  return () => channel.close();
+}
+
+export function broadcastMessage<T>(channelName: string, message: T): void {
+  if (typeof BroadcastChannel === "undefined") return;
+  const channel = new BroadcastChannel(channelName);
+  channel.postMessage(message);
+  channel.close();
+}
+
+export function waitForFocusAck(
+  ackStorageKey: string,
+  requestId: string,
+  fallback: () => void,
+  delayMs: number = TAB_FOCUS_DELAY_MS,
+): void {
+  window.setTimeout(() => {
+    try {
+      if (sessionStorage.getItem(ackStorageKey) === requestId) {
+        sessionStorage.removeItem(ackStorageKey);
+        return;
+      }
+    } catch {
+      /* ignore */
+    }
+    fallback();
+  }, delayMs);
+}
+
+export function focusWindowSafe(win: Window | null): void {
+  try {
+    win?.focus();
+  } catch {
+    /* ignore */
+  }
+}