test(webui): find the workspace tabs by the buttons they now are

The workspace tab strip is a group of toggle buttons (aria-pressed), not a
tablist, because each row carries a close button that a tablist may not
own. The browser and terminal specs still asked for role="tab", so they
could not find the pages they open.

Author: stevenjj33

packages/webui/test/browser/browser-workspace.spec.mjs

@@ -262,11 +262,11 @@ test("the strip shows the page the runtime published, and the panel follows it",
 
   // Two pages, two rows in the strip. The rows are the workspace's own tabs,
   // so they are found by the page's title -- which is what a person reads.
-  await expect(page.getByRole("tab", { name: "Example Domain" })).toBeVisible();
-  await expect(page.getByRole("tab", { name: "Another Page" })).toBeVisible();
+  await expect(page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Example Domain", exact: true })).toBeVisible();
+  await expect(page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Another Page", exact: true })).toBeVisible();
 
   // Choosing one brings its page to the front, and the address bar names it.
-  await page.getByRole("tab", { name: "Another Page" }).click();
+  await page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Another Page", exact: true }).click();
   await expect(page.getByTestId("browser-toolbar-url")).toHaveValue("https://another.test/");
   await expect(page.getByTestId("browser-panel-frame")).toBeVisible();
 });
@@ -305,7 +305,7 @@ test("a gesture names the page in front, not the page the Agent is on", async ({
   });
   await openApp(page);
   await openPanel(page);
-  await page.getByRole("tab", { name: "Person page" }).click();
+  await page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Person page", exact: true }).click();
   await expect(page.getByTestId("browser-toolbar-url")).toHaveValue("https://person.test/");
 
   await page.getByTestId("browser-panel-frame").click();

packages/webui/test/browser/terminal-cross-page.spec.mjs

@@ -29,7 +29,7 @@ const openTerminalTab = async (page) => {
     .getByTestId("workspace-panel-controls")
     .getByRole("button", { name: "浏览器" })
     .click();
-  const existing = page.getByTestId("workspace-panel").getByRole("tab", { name: "终端" });
+  const existing = page.getByTestId("workspace-panel").getByRole("button", { name: "终端", exact: true });
   if (await existing.count()) {
     await existing.click();
     return;