feat: add adaptive agent workspace windows

src/styles.css

@@ -899,6 +899,49 @@ button.agent-history-session-trigger:not(:disabled):active {
   background: var(--surface-reading);
 }
 
+/* Desktop Main Frame uses solid, work-focused panes instead of map-overlay acrylic. */
+.workbench-main-frame .agent-panel-shell,
+.workbench-main-frame .scheduled-feed-panel-shell,
+.workbench-main-frame .surface-dock,
+.workbench-main-frame .surface-control,
+.workbench-main-frame .surface-reading {
+  backdrop-filter: none;
+  -webkit-backdrop-filter: none;
+}
+
+.workbench-main-frame .agent-panel-shell {
+  border: 0;
+  border-radius: 0;
+  background: #f7f9fb;
+  box-shadow: none;
+}
+
+.workbench-main-frame .scheduled-feed-panel-shell {
+  width: 100%;
+  max-width: none;
+  height: 100%;
+  border: 0;
+  border-radius: 0;
+  background: #f7f9fb;
+  box-shadow: none;
+}
+
+.workbench-main-frame .workspace-window-titlebar {
+  -webkit-user-select: none;
+  user-select: none;
+}
+
+@media (forced-colors: active) {
+  .workbench-main-frame [aria-label="工作台导航"],
+  .workbench-main-frame [aria-label="工作区窗口任务栏"],
+  .workbench-main-frame .workspace-window-titlebar {
+    border-color: CanvasText;
+    background: Canvas;
+    color: CanvasText;
+    box-shadow: none;
+  }
+}
+
 .agent-ready-orbit,
 .agent-ready-core {
   transform-box: fill-box;