fix: use specific data-testid selectors in project switcher assertions

Replace generic getByRole('button', { name: /.../ }) selectors with specific
getByTestId('project-switcher-project-') to avoid strict mode
violations where the selector resolves to multiple elements (project switcher
button and sidebar button).

Fixes failing E2E tests:
- feature-manual-review-flow.spec.ts
- new-project-creation.spec.ts
- open-existing-project.spec.ts

apps/ui/tests/features/feature-manual-review-flow.spec.ts

@@ -130,8 +130,8 @@ test.describe('Feature Manual Review Flow', () => {
       await page.waitForTimeout(300);
     }
 
-    // Verify we're on the correct project (project name appears in sidebar button)
-    await expect(page.getByRole('button', { name: new RegExp(projectName) })).toBeVisible({
+    // Verify we're on the correct project (project switcher button shows project name)
+    await expect(page.getByTestId(`project-switcher-project-${projectName}`)).toBeVisible({
       timeout: 10000,
     });