feat: add WorkUnitEditorModal component for managing work units

- Implemented WorkUnitEditorModal.razor for creating and editing work units.
- Added necessary services and parameters for data handling.
- Included computed values for calculated hours, gross income, and net income.
- Enhanced UI with modal structure and styling.

fix: update _Imports.razor to include Shared components

- Added reference to WorkUnitEditorModal in _Imports.razor for accessibility.

feat: extend CalendarEventDocument with StartDate and EndDate properties

- Updated CalendarEventDocument.cs to include StartDate and EndDate for better event management.

feat: create CalendarEventFormatter for event description formatting

- Introduced CalendarEventFormatter.cs to handle display logic for calendar events.

fix: enhance CouchbaseLiteWorkDayService for calendar event management

- Updated methods to handle new StartDate and EndDate properties in calendar events.
- Improved event saving and deletion logic.

test: add Playwright tests for date locale functionality

- Created date-locale.spec.ts to verify date picker behavior and formatting.

style: enhance app.css with modal and date input styles

- Added styles for calendar modal, date input, and related components for improved UI.

tests/playwright/date-locale.spec.ts

@@ -0,0 +1,30 @@
+import { expect, test } from '@playwright/test';
+
+test.use({
+  locale: 'en-US'
+});
+
+async function waitForBlazorConnection(page: Parameters<typeof test>[0]['page']) {
+  await page.waitForTimeout(750);
+}
+
+test('date picker popup is monday-first and uses european formatting', async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 960 });
+  await page.goto('/calendar-event', { waitUntil: 'networkidle' });
+  await waitForBlazorConnection(page);
+
+  const startDateInput = page.getByTestId('calendar-event-start-date-input');
+  await expect(startDateInput).toBeVisible();
+
+  await startDateInput.click();
+
+  const popup = page.getByTestId('calendar-event-start-date-popover');
+  await expect(popup).toBeVisible();
+
+  const weekdayHeaders = popup.getByTestId('date-picker-weekday');
+  await expect(weekdayHeaders).toHaveCount(7);
+  await expect(weekdayHeaders.first()).toHaveText(/^(Mon|Lun)$/);
+
+  await page.getByTestId('calendar-event-start-date-day-2026-04-22').click();
+  await expect(startDateInput).toHaveValue(/^22\/\d{2}\/\d{4}$/);
+});