fix: 调整工作空间工具栏层级避免覆盖抽屉

frontend/src/components/sidebar.css

@@ -224,7 +224,7 @@
   position: fixed;
   top: 0;
   right: var(--chat-space, 0px);
-  z-index: 1002;
+  z-index: 30;
   background: var(--surface);
   display: flex;
   align-items: center;

frontend/tests/sidebar.spec.ts

@@ -62,6 +62,18 @@ test("sidebar geometry, recent navigation, user menu and compact tools", async (
   ).toHaveAttribute("aria-current", "page");
   await page.getByRole("button", { name: "同步任务", exact: true }).click();
   await expect(page.locator(".job-panel")).toBeVisible();
+  // The drawer must receive pointer events where the global tools sit behind it.
+  await expect.poll(() =>
+    page.getByRole("toolbar").getByRole("button").evaluateAll((buttons) =>
+      buttons.every((button) => {
+        const rect = button.getBoundingClientRect();
+        return Boolean(document.elementFromPoint(
+          rect.x + rect.width / 2,
+          rect.y + rect.height / 2,
+        )?.closest(".job-panel"));
+      }),
+    ),
+  ).toBe(true);
   await page.locator(".job-panel .semi-sidesheet-close").click();
   await expect(page.locator(".job-panel")).not.toBeVisible();
   await page.getByRole("button", { name: "切换研究助手" }).click();