feat(clickTtTournamentRegistrationService): implement competition registration saving logic

- Added a new method `_saveCompetitionRegistration` to handle the saving of competition registrations, improving code organization and readability.
- Replaced direct calls to clickTtPlayerRegistrationService for saving with the new method, enhancing maintainability.
- Implemented error handling to verify successful registration and provide feedback if the registration confirmation is not displayed.

backend/services/clickTtTournamentRegistrationService.js

@@ -161,8 +161,7 @@ class ClickTtTournamentRegistrationService {
         await this._selectCompetitionMembers(page, group.entries, trace);
         await this._openControlStep(page, trace);
         await this._verifyControlPage(page, group.entries);
-        await clickTtPlayerRegistrationService._clickByText(page, 'Speichern', trace);
-        await page.waitForLoadState('domcontentloaded');
+        await this._saveCompetitionRegistration(page, group.entries, trace);
 
         for (const entry of group.entries) {
           entry.registered = true;
@@ -469,6 +468,24 @@ class ClickTtTournamentRegistrationService {
       }
     }
   }
+
+  async _saveCompetitionRegistration(page, entries, trace) {
+    await clickTtPlayerRegistrationService._clickByText(page, 'Speichern', trace);
+    await page.waitForLoadState('domcontentloaded');
+
+    const bodyText = normalizeText(await page.locator('body').innerText().catch(() => ''));
+    const stillOnControlPage = bodyText.includes('folgende spieler werden zum turnier angemeldet')
+      || bodyText.includes('turnier-teilnehmeranmeldung')
+      || await page.locator('input[type="submit"][value="Speichern"]').count().catch(() => 0);
+
+    if (stillOnControlPage) {
+      const expectedNames = entries.map((entry) => `${entry.member.firstName} ${entry.member.lastName}`);
+      throw new HttpError(
+        `Click-TT-Turnieranmeldung wurde nach "Speichern" nicht bestätigt: ${expectedNames.join(', ')}`,
+        500
+      );
+    }
+  }
 }
 
 export default new ClickTtTournamentRegistrationService();