test(18-01): add INT-01 Settings button opens modal test

- Create session-settings test directory
- Add Playwright test for Settings button opening modal
- Verify modal form elements: privacy select, description, Save/Cancel buttons
- Follow existing test patterns from chat-button.spec.ts

jam-ui/test/session-settings/session-settings.spec.ts

@@ -0,0 +1,39 @@
+import { test, expect } from '@playwright/test';
+import { loginToJamUI, createAndJoinSession } from '../utils/test-helpers';
+
+test.describe('Session Settings Modal', () => {
+  test.beforeEach(async ({ page }) => {
+    await loginToJamUI(page);
+    await createAndJoinSession(page);
+  });
+
+  test('INT-01: Settings button opens modal', async ({ page }) => {
+    // Locate Settings button by the gear icon alt text
+    const settingsButton = page.locator('img[alt="Settings"]');
+    await expect(settingsButton).toBeVisible();
+
+    // Click the Settings button
+    await settingsButton.click();
+
+    // Verify modal opens with "Session Settings" header
+    const modalHeader = page.locator('text=Session Settings');
+    await expect(modalHeader).toBeVisible({ timeout: 5000 });
+
+    // Verify form elements are visible
+    // Privacy select dropdown
+    const privacySelect = page.locator('[data-testid="session-privacy"]');
+    await expect(privacySelect).toBeVisible();
+
+    // Description textarea
+    const descriptionTextarea = page.locator('textarea[name="description"]');
+    await expect(descriptionTextarea).toBeVisible();
+
+    // Save button
+    const saveButton = page.locator('button:has-text("Save")');
+    await expect(saveButton).toBeVisible();
+
+    // Cancel button
+    const cancelButton = page.locator('button:has-text("Cancel")');
+    await expect(cancelButton).toBeVisible();
+  });
+});