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/components/calendar-year/calendar-year.html

@@ -146,6 +146,87 @@
 				<dd>{{ plan.metrics.longestWorkSequence }}</dd>
 			</div>
 		</dl>
+		@for (contribution of plan.timeWindowContributions ?? []; track contribution.ruleId) {
+			<section class="outcome-explanation declared-rule">
+				<h3>{{ contribution.label }}</h3>
+				<p>
+					{{ contribution.declaredDays.length }} {{ tr().bookedDays.booked }} +
+					{{ contribution.placementDates.length }}
+					{{ tr().planning.explanation.leaveDays }} =
+					<strong
+						>{{
+							contribution.declaredDays.length + contribution.placementDates.length
+						}}
+						/ {{ contribution.requested }}</strong
+					>
+				</p>
+				<p>
+					@for (day of contribution.declaredDays; track day.date) {
+						<span>{{ displayDate(day.date) }} · {{ tr().dayTypes[day.type] }} </span>
+					}
+				</p>
+				<p>{{ tr().bookedDays.fixed }}</p>
+			</section>
+		}
+		@if (plan.calculationDate) {
+			<p>{{ tr().planning.calculationDate }} : {{ displayDate(plan.calculationDate) }}</p>
+		}
+		@for (
+			contribution of plan.ifThenContributions ?? [];
+			track contribution.ruleId + contribution.occurrence
+		) {
+			<section class="outcome-explanation declared-rule">
+				<h3>{{ contribution.label }} · {{ displayDate(contribution.occurrence) }}</h3>
+				<p>
+					{{ contribution.declaredDays.length }} {{ tr().bookedDays.booked }} +
+					{{ contribution.placementDates.length }}
+					{{ tr().planning.explanation.leaveDays }} =
+					<strong>{{ contribution.requested }} / {{ contribution.requested }}</strong>
+				</p>
+				@for (day of contribution.declaredDays; track day.date) {
+					<span>{{ displayDate(day.date) }} · {{ tr().dayTypes[day.type] }} </span>
+				}
+				@if (contribution.declaredDays.length) {
+					<p>{{ tr().bookedDays.fixed }}</p>
+				}
+				@if (contribution.earnedEntitlement; as earned) {
+					<p>
+						{{
+							earned.added
+								? tr().planning.futureEntitlement
+								: tr().planning.includedEntitlement
+						}}
+						: {{ earned.quantity }} {{ tr().dayTypes[earned.type] }}
+					</p>
+					<p>
+						{{ tr().planning.details.available }}
+						{{ displayDate(earned.availableFrom) }} ·
+						{{ tr().planning.details.expires }} {{ displayDate(earned.expiryDate) }}
+					</p>
+				}
+			</section>
+		}
+		@for (period of plan.timeOffPeriods; track period.start) {
+			@if (period.declaredDates?.length) {
+				<section class="outcome-explanation declared-period">
+					<h3>
+						{{ tr().planning.explanation.breakTitle }} ·
+						{{ displayDate(period.start) }} – {{ displayDate(period.end) }}
+					</h3>
+					<p>
+						{{ period.declaredDates!.length }} {{ tr().bookedDays.booked }} +
+						{{ period.placementDates.length }}
+						{{ tr().planning.explanation.leaveDays }} +
+						{{ period.nonWorkingDates.length }}
+						{{ tr().planning.explanation.freeDays }} =
+						<strong
+							>{{ period.duration }} {{ tr().planning.explanation.daysOff }}</strong
+						>
+					</p>
+					<p>{{ tr().bookedDays.fixed }}</p>
+				</section>
+			}
+		}
 	}
 
 	<div class="plan-insights">
@@ -257,6 +338,13 @@
 								{{ displayDate(period.start) }} – {{ displayDate(period.end) }}
 							</h4>
 							<div class="break-equation">
+								@if (period.declaredDates?.length) {
+									<span
+										><strong>{{ period.declaredDates!.length }}</strong
+										>{{ tr().bookedDays.booked }}</span
+									>
+									<span>+</span>
+								}
 								<span
 									><strong>{{ period.placementDates.length }}</strong
 									>{{ tr().planning.explanation.leaveDays }}</span