fix(test): add eForm/planningTag/assignee selection in I1

The Save button on the create-event modal is gated on having an
eForm, planning tag, and at least one assignee. Without them the
button stays disabled ("Mindst én medarbejder skal tildeles")
and the test times out waiting for the create POST.

Mirror the existing createSimpleEvent helper in calendar-resize.spec.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: renemadsen

eform-client/playwright/e2e/plugins/backend-configuration-pn/r/calendar-ui-enhancements.spec.ts

@@ -661,9 +661,24 @@ test.describe.serial('Calendar UI enhancements', () => {
       // we want to override.
       await calendarPage.openCreateModalAt9AM();
       await page.locator('#calendarEventTitle').fill(eventTitle);
-      // Defaults from the modal: first eForm and a board are auto-picked;
-      // we don't set planningTag/assignee here because the suite's seeded
-      // worker isn't strictly required to validate reconstruction.
+      // Backend validation requires eForm + planning tag + at least one
+      // assignee — same pattern as createSimpleEvent in calendar-resize.spec.ts.
+      const eform = page.locator('#calendarEventEform');
+      await eform.click();
+      await page.locator('.ng-dropdown-panel').waitFor({ state: 'visible', timeout: 5000 });
+      await page.locator('.ng-dropdown-panel .ng-option').first().click();
+      await page.waitForTimeout(300);
+      const planningTag = page.locator('#calendarEventPlanningTag');
+      await planningTag.click();
+      await page.locator('.ng-dropdown-panel').waitFor({ state: 'visible', timeout: 5000 });
+      await page.locator('.ng-dropdown-panel .ng-option').first().click();
+      await page.waitForTimeout(300);
+      const assignee = page.locator('#calendarEventAssignee');
+      await assignee.click();
+      await page.locator('.ng-dropdown-panel').waitFor({ state: 'visible', timeout: 5000 });
+      await page.locator('.ng-dropdown-panel .ng-option').first().click();
+      await page.locator('#calendarEventTitle').click();
+      await page.waitForTimeout(300);
 
       // ----- Step 2: open repeat dropdown → Tilpasset… ----------------
       // The repeat select is [searchable]="false", so click .ng-select-container.