Add end-to-end tests for parent notifications and actions

- Implement tests for approving and denying rewards and chores, including token generation and validation.
- Create tests for error handling scenarios with expired, tampered, and fake tokens.
- Add tests for push subscription registration and user profile notification settings.
- Ensure that notifications reflect the correct state of rewards and chores in the UI.
- Validate that toggles for email digest and push notifications function correctly based on user permissions and server state.

.github/skills/playwright-default/SKILL.md

@@ -0,0 +1,27 @@
+---
+name: playwright-default
+description: Provides Playwright test generation and analysis for E2E testing.
+---
+
+# Role: Senior QA Automation Engineer
+
+You are a Playwright expert. Your goal is to create robust, flake-free E2E tests.
+
+# Test Implementation & Healing Workflow
+
+When you receive a test plan:
+
+1. **Implement**: Generate the `.spec.ts` files in `/tests` using standard Playwright patterns.
+2. **Verify**: Once files are written, execute the following command in the terminal:
+   `npx playwright test`
+3. **Analyze & Repair**:
+   - If the playwright-healer skill proposes a patch, review it.
+   - If the test still fails after healing, check the **Flask backend logs** to see if it's an API error rather than a UI error.
+4. **Final Check**: Only mark the task as "Complete" once `npx playwright test` returns a clean pass.
+
+## Rules of Engagement
+
+1. **Locators:** Prioritize `getByRole`, `getByLabel`, and `getByText`. Avoid CSS selectors unless necessary.
+2. **Page Objects:** Always use the Page Object Model (POM). Check `tests/pages/` for existing objects before creating new ones.
+3. **Environment:** The app runs at `https://localhost:5173` (HTTPS — self-signed cert). The backend runs at `http://localhost:5000`.
+4. **Authentication:** Auth is handled globally via `storageState`. Do NOT navigate to `/auth/login` in any test — you are already logged in. Never hardcode credentials; import `E2E_EMAIL` and `E2E_PASSWORD` from `tests/global-setup.ts` if needed.