fix(ui): address PR review comments and fix E2E tests for unified sidebar

- Add try/catch for getElectronAPI() in sidebar-footer with window.open fallback
- Use formatShortcut() for OS-aware hotkey display in sidebar-header
- Remove unnecessary optional chaining on project.icon
- Remove redundant ternary in sidebar-navigation className
- Update E2E tests to use new project-dropdown-trigger data-testid

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/tests/projects/open-existing-project.spec.ts

@@ -18,7 +18,6 @@ import {
   authenticateForTests,
   handleLoginScreenIfPresent,
   waitForNetworkIdle,
-  sanitizeForTestId,
 } from '../utils';
 
 // Create unique temp dir for this test run
@@ -169,11 +168,11 @@ test.describe('Open Project', () => {
     }
 
     // Wait for a project to be set as current and visible on the page
-    // The project name appears in the project switcher button
-    // Use ends-with selector since data-testid format is: project-switcher-{id}-{sanitizedName}
+    // The project name appears in the project dropdown trigger
     if (targetProjectName) {
-      const sanitizedName = sanitizeForTestId(targetProjectName);
-      await expect(page.locator(`[data-testid$="-${sanitizedName}"]`)).toBeVisible({
+      await expect(
+        page.locator('[data-testid="project-dropdown-trigger"]').getByText(targetProjectName)
+      ).toBeVisible({
         timeout: 15000,
       });
     }