fix: mobile chat in new layout

web/src/lib/dashboard-flags.ts

@@ -0,0 +1,15 @@
+declare global {
+  interface Window {
+    /** Set true by the server only for `hermes dashboard --tui` (or HERMES_DASHBOARD_TUI=1). */
+    __HERMES_DASHBOARD_EMBEDDED_CHAT__?: boolean;
+    /** @deprecated Older injected name; treated as on when true. */
+    __HERMES_DASHBOARD_TUI__?: boolean;
+  }
+}
+
+/** True only when the dashboard was started with embedded TUI Chat (`hermes dashboard --tui`). */
+export function isDashboardEmbeddedChatEnabled(): boolean {
+  if (typeof window === "undefined") return false;
+  if (window.__HERMES_DASHBOARD_EMBEDDED_CHAT__ === true) return true;
+  return window.__HERMES_DASHBOARD_TUI__ === true;
+}