fix(planning): react only to calculations started by the mounted calendar

Re-mounting the calendar no longer records a duration sample or
announces the previous result, explanation or rejected explanation.
Starting a calculation during a cancellation announces loading and
keeps focus where it is. Only rejected explanation deliveries are
announced, as before. Replacement tests now replace a real plan.

Refs #275, #274

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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

@@ -1992,6 +1992,146 @@ describe('CalendarYear planning outcome boundary', () => {
 		},
 	);
 
+	it('does not calibrate or announce a previous result when the planner is remounted', async () => {
+		const { calendar } = calendarFor(plan, explanation);
+		calendar.createPlanningCalculation
+			.mockReturnValueOnce(calculationFor(plan, explanation))
+			.mockReturnValueOnce({
+				...calculationFor(plan, explanation),
+				outcome: new Promise(() => undefined),
+			});
+		await TestBed.configureTestingModule({
+			imports: [CalendarYear],
+			providers: [
+				provideZonelessChangeDetection(),
+				{ provide: CalendarService, useValue: calendar },
+			],
+		}).compileComponents();
+		const record = vi.spyOn(TestBed.inject(PlanningDurationService), 'recordCompletion');
+		const settle = async (fixture: ComponentFixture<CalendarYear>) => {
+			fixture.detectChanges();
+			await fixture.whenStable();
+			await new Promise<void>((resolve) => setTimeout(resolve, 0));
+			fixture.detectChanges();
+		};
+		const first = TestBed.createComponent(CalendarYear);
+		await settle(first);
+		expect(record).toHaveBeenCalledTimes(1);
+		first.destroy();
+
+		const second = TestBed.createComponent(CalendarYear);
+		await settle(second);
+		expect(record).toHaveBeenCalledTimes(1);
+		expect(second.componentInstance['liveMessage']()).toBe(
+			second.componentInstance['tr']().loading,
+		);
+	});
+
+	it('does not announce a previous rejected explanation when the planner is remounted', async () => {
+		const { calendar } = calendarFor(plan, explanation);
+		const rejected = {
+			...calculationFor(plan, explanation),
+			explanation: Promise.reject(new Error('explanation exploded')),
+		};
+		rejected.explanation.catch(() => undefined);
+		calendar.createPlanningCalculation.mockReturnValueOnce(rejected).mockReturnValueOnce({
+			...calculationFor(plan, explanation),
+			outcome: new Promise(() => undefined),
+		});
+		await TestBed.configureTestingModule({
+			imports: [CalendarYear],
+			providers: [
+				provideZonelessChangeDetection(),
+				{ provide: CalendarService, useValue: calendar },
+			],
+		}).compileComponents();
+		const settle = async (fixture: ComponentFixture<CalendarYear>) => {
+			fixture.detectChanges();
+			await fixture.whenStable();
+			await new Promise<void>((resolve) => setTimeout(resolve, 0));
+			fixture.detectChanges();
+		};
+		const first = TestBed.createComponent(CalendarYear);
+		await settle(first);
+		expect(first.componentInstance['liveMessage']()).toContain('explanation exploded');
+		first.destroy();
+
+		const second = TestBed.createComponent(CalendarYear);
+		await settle(second);
+		expect(second.componentInstance['liveMessage']()).toBe(
+			second.componentInstance['tr']().loading,
+		);
+	});
+
+	it('announces loading and keeps focus when a calculation starts during a cancellation', async () => {
+		const first = deferred<PlanningOutcome>();
+		const { calendar, calculation } = calendarFor(plan, undefined);
+		calendar.createPlanningCalculation
+			.mockReturnValueOnce({ ...calculation, outcome: first.promise })
+			.mockReturnValueOnce({ ...calculation, outcome: new Promise(() => undefined) });
+		await TestBed.configureTestingModule({
+			imports: [CalendarYear],
+			providers: [
+				provideZonelessChangeDetection(),
+				{ provide: CalendarService, useValue: calendar },
+			],
+		}).compileComponents();
+		const fixture = TestBed.createComponent(CalendarYear);
+		fixture.detectChanges();
+		const root = fixture.nativeElement as HTMLElement;
+		const live = () => fixture.componentInstance['liveMessage']();
+		const tr = fixture.componentInstance['tr']();
+		activateWithKeyboard(root.querySelector<HTMLButtonElement>('.cancel-calculation')!);
+		fixture.detectChanges();
+		expect(live()).toBe(tr.planning.cancelling);
+		const outside = document.createElement('button');
+		document.body.append(outside);
+		outside.focus();
+
+		TestBed.inject(PlanningCalculationService).start();
+		fixture.detectChanges();
+		await fixture.whenStable();
+		first.resolve(plan);
+		await fixture.whenStable();
+		fixture.detectChanges();
+
+		expect(document.activeElement).toBe(outside);
+		expect(live()).toBe(tr.loading);
+		outside.remove();
+	});
+
+	it.each([
+		['a delivered explanation error', false],
+		['a rejected explanation', true],
+	])('announces only %s when it rejected', async (_, rejected) => {
+		const reason = { code: 'explanation-error', message: 'Explanation boom' };
+		const { calendar } = calendarFor(plan, undefined);
+		calendar.createPlanningCalculation.mockReturnValue({
+			...calculationFor(plan, undefined),
+			explanation: rejected
+				? Promise.reject(new Error(reason.message))
+				: Promise.resolve(undefined),
+			explanationError: Promise.resolve(rejected ? undefined : reason),
+		});
+		await TestBed.configureTestingModule({
+			imports: [CalendarYear],
+			providers: [
+				provideZonelessChangeDetection(),
+				{ provide: CalendarService, useValue: calendar },
+			],
+		}).compileComponents();
+		const fixture = TestBed.createComponent(CalendarYear);
+		fixture.detectChanges();
+		await fixture.whenStable();
+		await new Promise<void>((resolve) => setTimeout(resolve, 0));
+		fixture.detectChanges();
+
+		const service = TestBed.inject(PlanningCalculationService);
+		expect(service.explanationError()).toMatchObject(reason);
+		expect(service.explanationRejected()).toBe(rejected);
+		expect(fixture.componentInstance['liveMessage']().includes(reason.message)).toBe(rejected);
+	});
+
 	it('displays an accepted historical year below 100 without shifting it to the twentieth century', async () => {
 		await TestBed.configureTestingModule({
 			imports: [CalendarYear],
@@ -2190,6 +2330,9 @@ describe('CalendarYear planning outcome boundary', () => {
 		['PlanningIncomplete without incumbent', incomplete],
 	] as const)('clears stale calendar results for %s', async (_, outcome: PlanningOutcome) => {
 		const { calendar } = calendarFor(outcome);
+		calendar.createPlanningCalculation
+			.mockReturnValueOnce(calculationFor(plan, explanation))
+			.mockReturnValueOnce(calculationFor(outcome));
 		await TestBed.configureTestingModule({
 			imports: [CalendarYear],
 			providers: [
@@ -2198,10 +2341,26 @@ describe('CalendarYear planning outcome boundary', () => {
 			],
 		}).compileComponents();
 		const fixture: ComponentFixture<CalendarYear> = TestBed.createComponent(CalendarYear);
+		const service = TestBed.inject(PlanningCalculationService);
+		const settle = async () => {
 			fixture.detectChanges();
 			await fixture.whenStable();
+			await new Promise<void>((resolve) => setTimeout(resolve, 0));
+			fixture.detectChanges();
+		};
+		await settle();
+		const root = fixture.nativeElement as HTMLElement;
+		expect(service.displayedPlan()).toBeDefined();
+		expect(
+			Array.from(root.querySelectorAll('.plan-summary dd')).map((e) => e.textContent?.trim()),
+		).toEqual(['2', '4', '6']);
 
-		expect(TestBed.inject(PlanningCalculationService).displayedPlan()).toBeUndefined();
+		service.start();
+		await settle();
+
+		expect(service.displayedPlan()).toBeUndefined();
+		expect(root.querySelector('.plan-summary')).toBeNull();
+		expect(root.querySelectorAll('button.selected')).toHaveLength(0);
 	});
 
 	it('keeps and summarizes a returned result', async () => {

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

@@ -147,6 +147,9 @@ export class CalendarYear {
 
 	private counterfactualVersion = 0;
 	private wasCancelling = false;
+	private readonly initialAccepted = this.calculations.accepted();
+	private readonly initialExplanation = this.calculations.explanation();
+	private readonly initialExplanationError = this.calculations.explanationError();
 	private displayDateLocale = '';
 	private displayDateFormatter?: Intl.DateTimeFormat;
 
@@ -314,18 +317,20 @@ export class CalendarYear {
 				});
 		});
 		effect(() => {
-			if (this.isLoading()) untracked(() => this.liveMessage.set(this.tr().loading));
+			if (this.calculations.pendingId() !== null)
+				untracked(() => this.liveMessage.set(this.tr().loading));
 		});
 		effect(() => {
+			const pending = this.calculations.pendingId() !== null;
 			const cancelling = this.isCancelling();
 			untracked(() => {
-				if (this.wasCancelling && !cancelling) this.resultsTitle()?.nativeElement.focus();
+				if (this.wasCancelling && !pending) this.resultsTitle()?.nativeElement.focus();
 				this.wasCancelling = cancelling;
 			});
 		});
 		effect(() => {
 			const accepted = this.calculations.accepted();
-			if (!accepted) return;
+			if (!accepted || accepted === this.initialAccepted) return;
 			untracked(() => {
 				this.closeStatistics();
 				this.selectedPlacementIndex.set(0);
@@ -351,7 +356,8 @@ export class CalendarYear {
 		});
 		effect(() => {
 			const explanation = this.calculations.explanation();
-			if (explanation?.kind !== 'PlanExplanation') return;
+			if (explanation?.kind !== 'PlanExplanation' || explanation === this.initialExplanation)
+				return;
 			untracked(() => {
 				this.selectPlacement(0, false);
 				const outcome = this.planningOutcome();
@@ -362,7 +368,11 @@ export class CalendarYear {
 		});
 		effect(() => {
 			const reason = this.explanationError();
-			if (reason?.code === 'explanation-error')
+			if (
+				reason &&
+				reason !== this.initialExplanationError &&
+				this.calculations.explanationRejected()
+			)
 				untracked(() =>
 					this.liveMessage.set(
 						`${this.tr().planning.explanationError} ${reason.message}`,

src/app/components/user-input/user-input.spec.ts

@@ -155,6 +155,33 @@ describe('UserInput', () => {
 		expect(card.textContent).toBe(explanation);
 	});
 
+	it('clears the remaining-days summary when a valid plan is replaced by a conflict', async () => {
+		await calculate({
+			horizon: { start: '2027-05-01', end: '2027-05-10' },
+			balances: [
+				{
+					id: 'other',
+					type: 'other',
+					quantity: 1,
+					availableFrom: '2027-05-10',
+					expiryDate: '2028-05-10',
+				},
+			],
+			rules: [],
+		});
+		const root = fixture.nativeElement as HTMLElement;
+		expect(calculations.displayedPlan()).toBeDefined();
+		expect(root.querySelector('.warning-card')).not.toBeNull();
+
+		await show(calculations.accepted()!.calculation!, {
+			kind: 'PlanningConflict',
+			reasons: [],
+			conflictingRuleIds: ['rule'],
+		});
+		expect(calculations.displayedPlan()).toBeUndefined();
+		expect(root.querySelector('.warning-card')).toBeNull();
+	});
+
 	it('explains usable leave kept for later and incomplete balances without attempt controls', async () => {
 		TestBed.inject(TranslationService).setLanguage('fr');
 		await calculate({

src/app/services/planning-calculation.service.ts

@@ -17,6 +17,7 @@ import { UserInputService } from './user-input-service';
 type Horizon = { start: string; end: string };
 
 interface PendingCalculation {
+	id: number;
 	horizon: Horizon;
 	progress: number;
 	cancelling: boolean;
@@ -78,6 +79,7 @@ export class PlanningCalculationService {
 	private readonly acceptedState = signal<AcceptedCalculation | null>(null);
 	private readonly explanationState = signal<PlanningExplanation | null>(null);
 	private readonly explanationErrorState = signal<PlanningReason | null>(null);
+	private readonly explanationRejectedState = signal(false);
 
 	readonly request = computed(() => {
 		const horizon = this.settings.planningHorizon();
@@ -101,6 +103,8 @@ export class PlanningCalculationService {
 	readonly accepted = this.acceptedState.asReadonly();
 	readonly explanation = this.explanationState.asReadonly();
 	readonly explanationError = this.explanationErrorState.asReadonly();
+	readonly explanationRejected = this.explanationRejectedState.asReadonly();
+	readonly pendingId = computed(() => this.pendingState()?.id ?? null);
 	readonly isCalculating = computed(() => this.pendingState() !== null);
 	readonly isCancelling = computed(() => this.pendingState()?.cancelling ?? false);
 	readonly progress = computed(() => this.pendingState()?.progress ?? 0);
@@ -124,7 +128,12 @@ export class PlanningCalculationService {
 		const requestedAt = performance.now();
 		const version = ++this.version;
 		this.userInput.declarationEntrySignal.set(false);
-		this.pendingState.set({ horizon: request.horizon, progress: 0, cancelling: false });
+		this.pendingState.set({
+			id: version,
+			horizon: request.horizon,
+			progress: 0,
+			cancelling: false,
+		});
 		let calculation: PlanningCalculationContext;
 		try {
 			calculation = this.calendar.createPlanningCalculation({
@@ -193,6 +202,7 @@ export class PlanningCalculationService {
 		const cancelling = this.pendingState()?.cancelling ?? false;
 		this.explanationState.set(null);
 		this.explanationErrorState.set(null);
+		this.explanationRejectedState.set(false);
 		this.pendingState.set(null);
 		this.acceptedState.set({
 			calculation,
@@ -209,7 +219,9 @@ export class PlanningCalculationService {
 	private loadArtifacts(calculation: PlanningCalculationContext): void {
 		const current = () => this.acceptedState()?.calculation === calculation;
 		const fail = (error: unknown) => {
-			if (current()) this.explanationErrorState.set(explanationFailure(error));
+			if (!current()) return;
+			this.explanationRejectedState.set(true);
+			this.explanationErrorState.set(explanationFailure(error));
 		};
 		calculation.explanation
 			.then((explanation) => current() && this.explanationState.set(explanation ?? null))