feat(stats): show gross earned leave by rule (#67)

src/app/components/calendar-year/calendar-year.ts

@@ -202,6 +202,25 @@ export class CalendarYear {
 	}
 
 	protected readonly displayedPlan = this.userInput.displayedPlanSignal;
+	protected readonly earnedLeave = computed(() => {
+		const byRule = new Map<string, { ruleId: string; label: string; quantity: number }>();
+		for (const contribution of this.displayedPlan()?.ifThenContributions ?? []) {
+			const entitlement = contribution.earnedEntitlement;
+			if (!entitlement?.added || entitlement.quantity <= 0) continue;
+			const entry = byRule.get(contribution.ruleId) ?? {
+				ruleId: contribution.ruleId,
+				label: contribution.label,
+				quantity: 0,
+			};
+			entry.quantity += entitlement.quantity;
+			byRule.set(entry.ruleId, entry);
+		}
+		const contributions = [...byRule.values()];
+		return {
+			total: contributions.reduce((total, contribution) => total + contribution.quantity, 0),
+			contributions,
+		};
+	});
 
 	protected readonly planExplanation = computed(() => {
 		const explanation = this.planningExplanation();