feat(planning): #62 #63 #64 enhance leave planner with calculation date and entitlement details

- Introduced calculationDate in various service interfaces and snapshots to track the date of planning calculations.
- Added futureEntitlement and includedEntitlement fields to the translation service and respective language files for better user feedback.
- Updated leave-planner.worker to handle calculationDate and declaredDays in requests.
- Enhanced tests to ensure proper handling of calculation dates and artifact retention during planning processes.
- Improved snapshot and explanation outputs to include calculation date for clarity in planning results.

src/app/benchmark/leave-planner-benchmark.spec.ts

@@ -7,6 +7,8 @@ import {
 } from './leave-planner-benchmark';
 
 describe('leave planner benchmark protocol', () => {
+	beforeEach(() => vi.setSystemTime(new Date('2024-01-01T12:00:00Z')));
+	afterEach(() => vi.useRealTimers());
 	// Warm-up and two repetitions include complete trace delivery after planning.
 	it('keeps seven deterministic scenarios including two and three years and a later earned consumer', async () => {
 		const scenarios = benchmarkScenarios();