I've introduced a "Test" button on the options page to allow you to test your webhook configurations.

Here are the key changes I made:
- Added a "Test" button to the webhook form in the options page.
- The button sends a test payload (`{ "url": "https://example.com" }`) to the configured webhook URL.
- Refactored the webhook sending logic into a reusable function `sendWebhook` in `utils/utils.js`.
- Updated the popup to use the new `sendWebhook` function.
- Updated the `README.md` to document the new feature.
- Fixed all unit tests that were failing as a result of these changes.

Author: google-labs-jules[bot]

tests/exportImport.test.js

@@ -43,6 +43,8 @@ describe('export and import logic', () => {
         </div>
         <button type="button" id="cancel-edit-btn" class="hidden"></button>
         <button type="submit"></button>
+        <button type="button" id="test-webhook-btn" class="hidden">__MSG_optionsTestButton__</button>
+        <p id="form-status-message" class="status-message"></p>
       </form>
       
       <!-- Group Management Modal -->