fix(ui): hide planning details by default

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

@@ -235,7 +235,7 @@ describe('CalendarYear planning outcome boundary', () => {
 		expect(summaryValues).toEqual(['2', '4', '6']);
 	});
 
-	it('keeps an incomplete incumbent visible with its interrupted-stage explanation', async () => {
+	it('keeps an incomplete incumbent visible and exposes its interrupted-stage details', async () => {
 		const outcome: PlanningIncompleteOutcome = {
 			kind: 'PlanningIncomplete',
 			incumbent: plan,
@@ -266,13 +266,17 @@ describe('CalendarYear planning outcome boundary', () => {
 		await new Promise<void>((resolve) => setTimeout(resolve, 0));
 		fixture.detectChanges();
 
+		const details = fixture.nativeElement.querySelector('.plan-details') as HTMLDetailsElement;
+		details.open = true;
+		details.dispatchEvent(new Event('toggle'));
+		fixture.detectChanges();
 		expect(fixture.nativeElement.querySelector('.incomplete-incumbent').textContent).toContain(
 			'holiday-week-value',
 		);
 		expect(fixture.nativeElement.querySelectorAll('button.selected')).toHaveLength(2);
 	});
 
-	it('shows the stable placement explanation by default and keeps the full plan visible', async () => {
+	it('keeps the simple result visible and reveals placement details on demand', async () => {
 		const { calendar, calculation } = calendarFor(plan, explanation);
 		await TestBed.configureTestingModule({
 			imports: [CalendarYear],
@@ -287,10 +291,18 @@ describe('CalendarYear planning outcome boundary', () => {
 		await new Promise<void>((resolve) => setTimeout(resolve, 0));
 		fixture.detectChanges();
 
-		expect(fixture.nativeElement.querySelector('.placement-explanation')).not.toBeNull();
-		expect(fixture.nativeElement.textContent).toContain('Paid leave');
+		const details = fixture.nativeElement.querySelector('.plan-details') as HTMLDetailsElement;
+		expect(details.open).toBe(false);
 		expect(fixture.nativeElement.querySelectorAll('button.selected')).toHaveLength(2);
+		expect(fixture.nativeElement.querySelector('button.current')).toBeNull();
+		expect(fixture.nativeElement.querySelectorAll('.legend-symbol')).toHaveLength(0);
+		expect(calculation.analyzeCounterfactual).not.toHaveBeenCalled();
+
+		details.open = true;
+		details.dispatchEvent(new Event('toggle'));
+		fixture.detectChanges();
 		expect(calculation.analyzeCounterfactual).toHaveBeenCalledWith(plan.placements[0]);
+		expect(fixture.nativeElement.textContent).toContain('Paid leave');
 
 		const next = fixture.nativeElement.querySelector(
 			'button[data-step="next"]',
@@ -300,6 +312,11 @@ describe('CalendarYear planning outcome boundary', () => {
 		expect(fixture.nativeElement.querySelector('button.current')?.dataset.date).toBe(
 			'2024-05-06',
 		);
+
+		details.open = false;
+		details.dispatchEvent(new Event('toggle'));
+		fixture.detectChanges();
+		expect(fixture.nativeElement.querySelector('button.current')).toBeNull();
 	});
 
 	it('renders conflict causes and replays an atomic trace decision', async () => {

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

@@ -137,10 +137,11 @@
 	}
 
 	@if (selectedExplanation(); as selected) {
+		<details class="plan-details" (toggle)="togglePlanDetails($event)">
+			<summary>{{ tr().planning.whyPlacement }}</summary>
 			<section class="placement-explanation" aria-labelledby="placement-explanation-title">
 				<header class="explanation-heading">
 					<div>
-					<p class="eyebrow">{{ tr().planning.whyPlacement }}</p>
 						<h3 id="placement-explanation-title">
 							{{ selected.placement.date }} · {{ balanceLabel(selected) }}
 						</h3>
@@ -175,7 +176,8 @@
 							type="button"
 							data-step="next"
 							[disabled]="
-							selectedPlacementIndex() === planExplanation()!.placements.length - 1
+								selectedPlacementIndex() ===
+								planExplanation()!.placements.length - 1
 							"
 							[attr.aria-label]="tr().planning.next"
 							(click)="stepPlacement('next')"
@@ -186,7 +188,8 @@
 							type="button"
 							data-step="last"
 							[disabled]="
-							selectedPlacementIndex() === planExplanation()!.placements.length - 1
+								selectedPlacementIndex() ===
+								planExplanation()!.placements.length - 1
 							"
 							[attr.aria-label]="tr().planning.last"
 							(click)="stepPlacement('last')"
@@ -222,7 +225,8 @@
 					<div>
 						<dt>{{ tr().planning.balance }}</dt>
 						<dd>
-						{{ balanceLabel(selected) }} <code>{{ selected.placement.balanceId }}</code>
+							{{ balanceLabel(selected) }}
+							<code>{{ selected.placement.balanceId }}</code>
 							@if (selected.balance) {
 								<br />{{ planningDate(selected.balance.availableFrom) }} –
 								{{ planningDate(selected.balance.expiryDate) }}
@@ -252,7 +256,10 @@
 							{{ selected.remainingQuantity }}
 							@if (selected.remainingBalance) {
 								<br /><small>
-								{{ formatIdentifier(selected.remainingBalance.classification) }} ·
+									{{
+										formatIdentifier(selected.remainingBalance.classification)
+									}}
+									·
 									{{ selected.remainingBalance.reason.message }}
 								</small>
 							}
@@ -379,7 +386,10 @@
 					} @else if (selectedCounterfactualResult(); as result) {
 						<div class="counterfactual-result">
 							<h5>{{ result.date }}</h5>
-						<p class="status-badge" [class.ineligible]="result.status === 'ineligible'">
+							<p
+								class="status-badge"
+								[class.ineligible]="result.status === 'ineligible'"
+							>
 								{{
 									result.status === 'eligible'
 										? tr().planning.eligible
@@ -453,6 +463,7 @@
 					}
 				</section>
 			</section>
+		</details>
 	} @else if (explanationError()) {
 		<p class="inline-error" role="alert">
 			{{ tr().planning.explanationError }} {{ explanationError()!.message }}
@@ -482,17 +493,20 @@
 				<span class="legend-swatch today" aria-hidden="true"></span
 				>{{ tr().dayTypes.today }}
 			</li>
+			@if (planDetailsOpen() || traceReplay()) {
 				<li>
 					<span class="legend-symbol" aria-hidden="true">◎</span
 					>{{ tr().planning.currentPlacement }}
 				</li>
 				<li>
-				<span class="legend-symbol" aria-hidden="true">✓</span>{{ tr().planning.eligible }}
+					<span class="legend-symbol" aria-hidden="true">✓</span
+					>{{ tr().planning.eligible }}
 				</li>
 				<li>
 					<span class="legend-symbol" aria-hidden="true">×</span
 					>{{ tr().planning.ineligible }}
 				</li>
+			}
 		</ul>
 	</div>
 

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

@@ -160,6 +160,7 @@
 
 .reason-list,
 .outcome-explanation,
+.plan-details,
 .placement-explanation,
 .trace-explorer {
 	margin: 0;
@@ -169,6 +170,12 @@
 	background: var(--ui-card-bg, #fff);
 }
 
+.plan-details .placement-explanation {
+	margin-block-start: 1rem;
+	padding: 0;
+	border: 0;
+}
+
 .outcome-explanation,
 .placement-explanation {
 	display: grid;
@@ -360,6 +367,7 @@ code {
 }
 
 .comparison-details summary,
+.plan-details > summary,
 .trace-explorer > summary,
 .candidate-list summary {
 	cursor: pointer;

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

@@ -61,6 +61,7 @@ export class CalendarYear {
 	protected readonly traceLoading = signal(false);
 	protected readonly traceResolved = signal(false);
 	protected readonly selectedPlacementIndex = signal(0);
+	protected readonly planDetailsOpen = signal(false);
 	protected readonly counterfactual = signal<CounterfactualAnalysis | null>(null);
 	protected readonly selectedCounterfactualDate = signal<string | null>(null);
 	protected readonly counterfactualLoading = signal(false);
@@ -146,7 +147,7 @@ export class CalendarYear {
 		if (this.counterfactual())
 			return this.selectedCounterfactualDate() ?? this.counterfactual()!.placement.date;
 		if (this.traceReplay()) return this.selectedTraceDecision()?.dates[0] ?? null;
-		return this.selectedExplanation()?.placement.date ?? null;
+		return this.planDetailsOpen() ? (this.selectedExplanation()?.placement.date ?? null) : null;
 	});
 
 	protected readonly dateStatuses = computed<Readonly<Record<string, CalendarDayStatus>>>(() => {
@@ -356,6 +357,7 @@ export class CalendarYear {
 		this.traceLoading.set(true);
 		this.traceResolved.set(false);
 		this.selectedPlacementIndex.set(0);
+		this.planDetailsOpen.set(false);
 		this.clearCounterfactual();
 		this.tracePhaseIndex.set(0);
 		this.traceDecisionIndex.set(0);
@@ -370,8 +372,6 @@ export class CalendarYear {
 		void calculation.explanation.then((explanation) => {
 			if (version !== this.calculationVersion) return;
 			this.planningExplanation.set(explanation ?? null);
-			if (explanation?.kind === 'PlanExplanation' && explanation.placements.length)
-				this.selectPlacement(0);
 		});
 		void calculation.explanationError.then((reason) => {
 			if (version === this.calculationVersion) this.explanationError.set(reason ?? null);
@@ -433,6 +433,13 @@ export class CalendarYear {
 		void this.analyzeSelection(explanation.placements[selected].placement);
 	}
 
+	protected togglePlanDetails(event: Event): void {
+		const open = (event.currentTarget as HTMLDetailsElement).open;
+		this.planDetailsOpen.set(open);
+		if (open) this.selectPlacement(this.selectedPlacementIndex());
+		else this.clearCounterfactual();
+	}
+
 	protected stepPlacement(step: 'first' | 'previous' | 'next' | 'last'): void {
 		const last = (this.planExplanation()?.placements.length ?? 1) - 1;
 		const current = this.selectedPlacementIndex();
@@ -448,7 +455,7 @@ export class CalendarYear {
 	}
 
 	protected selectCalendarDate(date: string): void {
-		if (!this.traceReplay()) {
+		if (!this.traceReplay() && this.planDetailsOpen()) {
 			const index = this.planExplanation()?.placements.findIndex(
 				(explanation) => explanation.placement.date === date,
 			);