feat(timeline): add EventForm curator create/edit form

One component for both routes: /new renders it empty, /[id]/edit seeds it from a
TimelineEventView. Composes EventTypeSelect, the shared DatePrecisionField, a
plain-textarea description, PersonMultiSelect and DocumentMultiSelect (personIds
/documentIds hidden inputs). lg:grid-cols-[2fr_1fr] collapsing to one column
below lg, sticky save bar, beforeNavigate unsaved-changes guard, submitting flag
via use:enhance (disabled submit), and a delete form gated by getConfirmService()
read lazily so the component mounts cleanly in isolation. Title/description/chip
labels render via default {...} escaping (CWE-79). Seeded DocumentRefs degrade
gracefully to DocumentOption (no precision fields). Pickers gain an inputId prop
so <label for> associates the control; eslint boundaries now lets timeline import
person+document (mirrors the geschichte editor). 6/6 component specs green.

Refs #781
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/eslint.config.js

@@ -199,7 +199,12 @@ export default defineConfig(
 						{ from: { type: 'user' }, allow: { to: { type: ['shared'] } } },
 						{ from: { type: 'notification' }, allow: { to: { type: ['shared'] } } },
 						{ from: { type: 'conversation' }, allow: { to: { type: ['shared'] } } },
-						{ from: { type: 'timeline' }, allow: { to: { type: ['shared'] } } },
+						// Timeline curator event editor selects persons and documents by
+						// design (mirrors the geschichte editor) — #781.
+						{
+							from: { type: 'timeline' },
+							allow: { to: { type: ['shared', 'person', 'document'] } }
+						},
 						{ from: { type: 'shared' }, allow: { to: { type: ['shared'] } } },
 						{
 							from: { type: 'routes' },

frontend/src/lib/document/DocumentMultiSelect.svelte

@@ -13,13 +13,16 @@ interface Props {
 	hiddenInputName?: string;
 	/** Empty-state text shown inside the chip container when nothing is selected. */
 	emptyLabel?: string;
+	/** id of the search input so a <label for=...> can be associated. */
+	inputId?: string;
 }
 
 let {
 	selectedDocuments = $bindable([]),
 	placeholder = m.geschichte_editor_search_document(),
 	hiddenInputName = 'documentIds',
-	emptyLabel = undefined
+	emptyLabel = undefined,
+	inputId = undefined
 }: Props = $props();
 
 let searchTerm = $state('');
@@ -97,6 +100,7 @@ function removeDocument(id: string | undefined) {
 
 		<input
 			bind:this={inputEl}
+			id={inputId}
 			type="text"
 			autocomplete="off"
 			bind:value={searchTerm}

frontend/src/lib/person/PersonMultiSelect.svelte

@@ -11,12 +11,15 @@ interface Props {
 	hiddenInputName?: string;
 	/** Empty-state text shown inside the chip container when nothing is selected. */
 	emptyLabel?: string;
+	/** id of the search input so a <label for=...> can be associated. */
+	inputId?: string;
 }
 
 let {
 	selectedPersons = $bindable([]),
 	hiddenInputName = 'receiverIds',
-	emptyLabel = undefined
+	emptyLabel = undefined,
+	inputId = undefined
 }: Props = $props();
 
 let searchTerm = $state('');
@@ -108,6 +111,7 @@ function removePerson(id: string | undefined) {
 
 		<input
 			bind:this={inputEl}
+			id={inputId}
 			type="text"
 			autocomplete="off"
 			bind:value={searchTerm}

frontend/src/lib/timeline/EventForm.svelte

@@ -0,0 +1,303 @@
+<script lang="ts">
+import { enhance } from '$app/forms';
+import { beforeNavigate } from '$app/navigation';
+import { m } from '$lib/paraglide/messages.js';
+import type { components } from '$lib/generated/api';
+import type { DatePrecision } from '$lib/shared/utils/documentDate';
+import { toPersonOption, type PersonOption } from '$lib/person/personOption';
+import { type DocumentOption } from '$lib/document/documentTypeahead';
+import { getConfirmService } from '$lib/shared/services/confirm.svelte.js';
+import PersonMultiSelect from '$lib/person/PersonMultiSelect.svelte';
+import DocumentMultiSelect from '$lib/document/DocumentMultiSelect.svelte';
+import DatePrecisionField from '$lib/shared/primitives/DatePrecisionField.svelte';
+import EventTypeSelect from '$lib/timeline/EventTypeSelect.svelte';
+import BackButton from '$lib/shared/primitives/BackButton.svelte';
+
+type TimelineEventView = components['schemas']['TimelineEventView'];
+
+/**
+ * Curator create/edit form for a timeline event. One component, two routes:
+ * `/new` renders it empty, `/[id]/edit` renders it seeded with `event`. The
+ * markup is never forked. All data flows through the route's +page.server.ts
+ * load + form action (SSR) — there is no client fetch('/api/...') here.
+ */
+interface FormResult {
+	error?: string;
+	titleError?: string;
+	dateError?: string;
+	title?: string;
+	description?: string;
+	type?: string;
+	personIds?: string[];
+	documentIds?: string[];
+}
+
+let {
+	event = undefined,
+	initialPersons = [],
+	initialDocuments = [],
+	originPersonId = '',
+	form = null
+}: {
+	event?: TimelineEventView;
+	initialPersons?: PersonOption[];
+	initialDocuments?: DocumentOption[];
+	originPersonId?: string;
+	form?: FormResult | null;
+} = $props();
+
+// Initial-state snapshot from incoming props (event > preserved fail payload).
+// The form owns these after mount; re-mount with a different `event` to reset.
+let title = $state(form?.title ?? event?.title ?? '');
+let description = $state(form?.description ?? event?.description ?? '');
+let type = $state<string>(form?.type ?? event?.type ?? 'PERSONAL');
+let dateIso = $state(event?.eventDate ?? '');
+let precision = $state<DatePrecision>((event?.precision as DatePrecision) ?? 'DAY');
+let endDateIso = $state(event?.eventDateEnd ?? '');
+
+let selectedPersons = $state<PersonOption[]>(
+	event?.persons ? event.persons.map(toPersonOption) : initialPersons
+);
+let selectedDocuments = $state<DocumentOption[]>(
+	event?.documents
+		? event.documents.map((d) => ({
+				// Graceful degradation: DocumentRef has no precision fields. formatDocumentOption
+				// falls back to the bare title when documentDate is the only date info present.
+				id: d.id,
+				title: d.title,
+				documentDate: d.documentDate
+			}))
+		: initialDocuments
+);
+
+const isEdit = $derived(event !== undefined);
+
+let titleTouched = $state(false);
+let submitting = $state(false);
+let dirty = $state(false);
+
+const titleEmpty = $derived(title.trim().length === 0);
+// Client-side title error fires instantly on a save attempt; the server's
+// titleError is the simultaneous-multi-field source on a real round-trip.
+const titleError = $derived(
+	form?.titleError ?? (titleTouched && titleEmpty ? m.event_editor_title_required() : '')
+);
+const dateError = $derived(form?.dateError ?? '');
+
+beforeNavigate(({ cancel }) => {
+	if (dirty && !submitting) {
+		const ok = window.confirm(m.event_editor_unsaved_changes());
+		if (!ok) cancel();
+	}
+});
+
+function markDirty() {
+	dirty = true;
+}
+
+// Guards a submit with a blank title client-side. The server re-validates and
+// owns the authoritative fail(400) with per-field flags.
+function handleSubmit(e: SubmitEvent) {
+	titleTouched = true;
+	if (titleEmpty) {
+		e.preventDefault();
+	}
+}
+
+async function confirmDelete(e: SubmitEvent) {
+	e.preventDefault();
+	const { confirm } = getConfirmService();
+	const ok = await confirm({
+		title: m.event_editor_delete_confirm_title(),
+		body: m.event_editor_delete_confirm_body(),
+		destructive: true,
+		confirmLabel: m.event_editor_delete()
+	});
+	if (ok) (e.target as HTMLFormElement).requestSubmit();
+}
+</script>
+
+<div class="mx-auto max-w-5xl px-4 py-8">
+	<div class="mb-6">
+		<BackButton />
+	</div>
+
+	<h1 class="mb-6 font-serif text-3xl font-bold text-ink">
+		{isEdit ? m.event_editor_edit_title() : m.event_editor_new_title()}
+	</h1>
+
+	{#if form?.error}
+		<p
+			class="mb-4 rounded-sm border border-danger/40 bg-danger/10 px-4 py-3 text-sm text-danger"
+			role="alert"
+		>
+			{form.error}
+		</p>
+	{/if}
+
+	<form
+		method="POST"
+		action="?/save"
+		onsubmit={handleSubmit}
+		use:enhance={() => {
+			submitting = true;
+			return async ({ update }) => {
+				submitting = false;
+				dirty = false;
+				await update();
+			};
+		}}
+	>
+		<input type="hidden" name="originPersonId" value={originPersonId} />
+
+		<div class="grid grid-cols-1 gap-6 lg:grid-cols-[2fr_1fr]">
+			<!-- Main column -->
+			<div class="flex flex-col gap-6">
+				<!-- Titel + Typ + Datum -->
+				<div class="rounded-sm border border-line bg-surface p-6 shadow-sm">
+					<h2 class="mb-5 text-xs font-bold tracking-widest text-ink-3 uppercase">
+						{m.event_editor_section_when()}
+					</h2>
+
+					<div class="mb-5">
+						<label for="event-title" class="mb-1 block text-sm font-medium text-ink-2">
+							{m.event_editor_title_label()}*
+						</label>
+						<input
+							id="event-title"
+							name="title"
+							type="text"
+							bind:value={title}
+							oninput={markDirty}
+							onblur={() => (titleTouched = true)}
+							maxlength="255"
+							placeholder={m.event_editor_title_placeholder()}
+							aria-required="true"
+							aria-invalid={titleError ? 'true' : undefined}
+							aria-describedby={titleError ? 'event-title-error' : undefined}
+							class="block min-h-[48px] w-full rounded border border-line px-3 py-3 text-base shadow-sm
+								{titleError
+								? 'border-red-400 focus:outline-none focus-visible:ring-2 focus-visible:ring-red-500'
+								: 'focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring'}"
+						/>
+						{#if titleError}
+							<p id="event-title-error" class="mt-1 text-sm text-danger" role="alert">
+								<span aria-hidden="true">⚠ </span>{titleError}
+							</p>
+						{/if}
+					</div>
+
+					<div class="mb-5">
+						<span class="mb-1 block text-sm font-medium text-ink-2"
+							>{m.event_editor_type_label()}</span
+						>
+						<EventTypeSelect value={type} name="type" onchange={() => markDirty()} />
+					</div>
+
+					<div class="grid grid-cols-1 gap-5 md:grid-cols-2">
+						<DatePrecisionField
+							bind:dateIso={dateIso}
+							bind:precision={precision}
+							bind:endDateIso={endDateIso}
+							dateInputName="eventDate"
+							endDateInputName="eventDateEnd"
+							dateLabel={m.form_label_date()}
+							dateTestId="event-date"
+							precisionTestId="event-precision"
+							endDateInnerTestId="event-end-date"
+						/>
+					</div>
+					{#if dateError}
+						<p class="mt-2 text-sm text-danger" role="alert">
+							<span aria-hidden="true">⚠ </span>{dateError}
+						</p>
+					{/if}
+				</div>
+
+				<!-- Beschreibung -->
+				<div class="rounded-sm border border-line bg-surface p-6 shadow-sm">
+					<h2 class="mb-5 text-xs font-bold tracking-widest text-ink-3 uppercase">
+						{m.event_editor_section_description()}
+					</h2>
+					<label for="event-description" class="sr-only">{m.event_editor_description_label()}</label
+					>
+					<textarea
+						id="event-description"
+						name="description"
+						bind:value={description}
+						oninput={markDirty}
+						rows="4"
+						placeholder={m.event_editor_description_placeholder()}
+						class="block w-full rounded border border-line px-3 py-3 text-base shadow-sm focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+					></textarea>
+				</div>
+			</div>
+
+			<!-- Sidebar -->
+			<div class="flex flex-col gap-6">
+				<!-- Beteiligte Personen -->
+				<div class="rounded-sm border border-line bg-surface p-6 shadow-sm">
+					<h2 class="mb-5 text-xs font-bold tracking-widest text-ink-3 uppercase">
+						{m.event_editor_section_persons()}
+					</h2>
+					<label for="event-persons-input" class="mb-1 block text-sm font-medium text-ink-2">
+						{m.event_editor_persons_label()}
+					</label>
+					<PersonMultiSelect
+						bind:selectedPersons={selectedPersons}
+						inputId="event-persons-input"
+						hiddenInputName="personIds"
+						emptyLabel={m.event_editor_persons_empty()}
+					/>
+				</div>
+
+				<!-- Verknüpfte Briefe -->
+				<div class="rounded-sm border border-line bg-surface p-6 shadow-sm">
+					<h2 class="mb-5 text-xs font-bold tracking-widest text-ink-3 uppercase">
+						{m.event_editor_section_documents()}
+					</h2>
+					<label for="event-documents-input" class="mb-1 block text-sm font-medium text-ink-2">
+						{m.event_editor_documents_label()}
+					</label>
+					<DocumentMultiSelect
+						bind:selectedDocuments={selectedDocuments}
+						inputId="event-documents-input"
+						hiddenInputName="documentIds"
+						emptyLabel={m.event_editor_documents_empty()}
+					/>
+				</div>
+			</div>
+		</div>
+
+		<!-- Save bar -->
+		<div
+			class="sticky bottom-0 z-10 -mx-4 mt-6 flex flex-col gap-3 border-t border-line bg-surface px-6 py-4 shadow-[0_-2px_8px_rgba(0,0,0,0.06)] sm:flex-row sm:items-center sm:justify-between"
+		>
+			<p class="font-sans text-xs text-ink-3">{m.event_editor_save_hint()}</p>
+			<div class="flex items-center gap-2">
+				<button
+					type="submit"
+					disabled={submitting}
+					class="inline-flex h-11 items-center rounded bg-primary px-4 font-sans text-sm font-medium text-primary-fg hover:opacity-90 focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring disabled:cursor-not-allowed disabled:opacity-50"
+				>
+					{m.event_editor_save()}
+				</button>
+			</div>
+		</div>
+	</form>
+
+	{#if isEdit}
+		<!-- Delete lives in its own form so it posts to the dedicated ?/delete action.
+			 getConfirmService() is read lazily inside the handler so the component
+			 mounts cleanly outside a layout (tests) where no confirm context exists. -->
+		<form method="POST" action="?/delete" onsubmit={confirmDelete} use:enhance class="mt-4">
+			<input type="hidden" name="originPersonId" value={originPersonId} />
+			<button
+				type="submit"
+				class="inline-flex h-11 items-center rounded border border-danger/40 px-4 font-sans text-sm font-medium text-danger hover:bg-danger/10 focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+			>
+				{m.event_editor_delete()}
+			</button>
+		</form>
+	{/if}
+</div>

frontend/src/lib/timeline/EventForm.svelte.spec.ts

@@ -0,0 +1,79 @@
+import { afterEach, describe, expect, it } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import EventForm from './EventForm.svelte';
+import type { components } from '$lib/generated/api';
+
+afterEach(() => cleanup());
+
+type TimelineEventView = components['schemas']['TimelineEventView'];
+
+/**
+ * Minimal TimelineEventView shape used to seed the edit form. Mirrors
+ * components['schemas']['TimelineEventView'] — all server-populated fields.
+ */
+function makeEvent(overrides: Partial<TimelineEventView> = {}): TimelineEventView {
+	return {
+		id: 'e1',
+		title: 'Umzug nach Berlin',
+		type: 'PERSONAL',
+		eventDate: '1925-04-01',
+		precision: 'DAY',
+		version: 0,
+		createdBy: 'u1',
+		createdAt: '2026-01-01T00:00:00Z',
+		updatedBy: 'u1',
+		updatedAt: '2026-01-01T00:00:00Z',
+		persons: [],
+		documents: [],
+		...overrides
+	};
+}
+
+describe('EventForm — date precision RANGE reveal (headline AC, REQ-008/009)', () => {
+	it('reveals the end-date field when precision is RANGE', async () => {
+		render(EventForm, { event: makeEvent({ precision: 'RANGE', eventDateEnd: '1925-05-01' }) });
+		await expect.element(page.getByLabelText('Enddatum')).toBeVisible();
+	});
+
+	it('hides the end-date field when precision is YEAR', async () => {
+		render(EventForm, { event: makeEvent({ precision: 'YEAR' }) });
+		await expect.element(page.getByTestId('end-date-region')).toBeInTheDocument();
+		expect(document.querySelector('#eventDateEnd')).toBeNull();
+	});
+});
+
+describe('EventForm — picker preselect (REQ-014)', () => {
+	it('preselects a person when initialPersons is provided', async () => {
+		render(EventForm, {
+			initialPersons: [{ id: 'p1', displayName: 'Anna Müller' }]
+		});
+		await expect.element(page.getByText('Anna Müller')).toBeInTheDocument();
+	});
+});
+
+describe('EventForm — required-field error (REQ-010)', () => {
+	it('shows a required-field error when title is blank and save is attempted', async () => {
+		render(EventForm, {});
+		await page.getByRole('button', { name: 'Speichern' }).click();
+		await expect.element(page.getByText('Bitte einen Titel eingeben.')).toBeInTheDocument();
+	});
+});
+
+describe('EventForm — submitting state (named AC)', () => {
+	it('renders an enabled submit button initially', async () => {
+		render(EventForm, { event: makeEvent() });
+		const btn = page.getByRole('button', { name: 'Speichern' });
+		await expect.element(btn).not.toBeDisabled();
+	});
+});
+
+describe('EventForm — server error surfaced inline (REQ-007/013)', () => {
+	it('renders the mapped error from the form prop', async () => {
+		render(EventForm, {
+			event: makeEvent(),
+			form: { error: 'Etwas ist schiefgelaufen.' }
+		});
+		await expect.element(page.getByText('Etwas ist schiefgelaufen.')).toBeInTheDocument();
+	});
+});