test(studio): follow the Terminal row in the sidebar keyboard walk

a87d04d added `terminal` as the last Professional destination, so the shared
roving tab stop now ends on Terminal and the View navigation holds 20 buttons.
The browser test still expected Components and 19.

The drift only surfaced now that the earlier CI gates (native DSH smoke, Test
Harness Studio package) pass again: `Test Harness Studio browser interaction`
runs on a single matrix leg and was skipped in every run since the Terminal
surface landed.

Test: npx playwright test (harness-studio) — 125 passed.

Co-authored-by: QoderAI (Qwen 3.8 Max) <qoder_ai@qoder.com>

Author: phodal

packages/harness-studio/test/browser/project-shell.spec.mjs

@@ -148,12 +148,12 @@ test("switches one shared View workbench between remembered Projects", async ({
   await page.keyboard.press("ArrowDown");
   await expect(navigation.getByRole("button", { name: /^Commits/ })).toBeFocused();
   await page.keyboard.press("End");
-  await expect(navigation.getByRole("button", { name: "Components", exact: true })).toBeFocused();
+  await expect(navigation.getByRole("button", { name: "Terminal", exact: true })).toBeFocused();
   await page.keyboard.press("Home");
   await expect(navigation.getByRole("button", { name: "Sessions", exact: true })).toBeFocused();
   expect(await page.locator(".studio-primary-nav nav button").evaluateAll((buttons) => buttons.filter((button) => button.tabIndex === 0).length)).toBe(1);
 
-  await expect(navigation.getByRole("button")).toHaveCount(19);
+  await expect(navigation.getByRole("button")).toHaveCount(20);
   await expect(page.locator(".studio-context-title")).toHaveText("Sessions");
 
   for (const layout of layouts) {