test(e2e): update command palette interaction for cross-platform compatibility

Entire-Checkpoint: c6e522b4276c

apps/electron-backend-e2e/src/electron-test-fixtures.ts

@@ -1536,7 +1536,9 @@ export async function resetMockServers(
 }
 
 async function openCommandPalette(page: Page): Promise<Locator> {
-    await page.locator('app-workspace-shell-header .command-trigger').click();
+    const modifier = process.platform === 'darwin' ? 'Meta' : 'Control';
+    await page.locator('body').focus();
+    await page.keyboard.press(`${modifier}+K`);
     const dialog = page.locator(
         'mat-dialog-container app-workspace-command-palette'
     );

apps/electron-backend-e2e/src/smoke.e2e.ts

@@ -61,14 +61,19 @@ test.describe('Electron App Smoke Test', () => {
         const app = await launchElectronApp(dataDir);
 
         try {
-            await expect(
-                app.mainWindow.getByRole('button', {
-                    name: 'Open command palette',
-                })
-            ).toBeVisible();
             await expect(
                 app.mainWindow.getByRole('button', { name: 'Add playlist' })
             ).toBeVisible();
+
+            const modifier =
+                process.platform === 'darwin' ? 'Meta' : 'Control';
+            await app.mainWindow.locator('body').focus();
+            await app.mainWindow.keyboard.press(`${modifier}+K`);
+            await expect(
+                app.mainWindow.locator(
+                    'mat-dialog-container app-workspace-command-palette'
+                )
+            ).toBeVisible();
         } finally {
             await closeElectronApp(app);
         }