feat(journey-editor): build JourneyAddBar with document picker and interlude draft

Two add buttons: document picker (DocumentPickerDropdown) and interlude inline
draft form. Interlude confirm is aria-disabled until text is non-empty. Closing
one panel opens the other. Tests cover all three plan test cases.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/geschichte/JourneyAddBar.svelte

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+<script lang="ts">
+import type { components } from '$lib/generated/api';
+import { m } from '$lib/paraglide/messages.js';
+import DocumentPickerDropdown from '$lib/document/DocumentPickerDropdown.svelte';
+
+type DocumentListItem = components['schemas']['DocumentListItem'];
+type DocumentOption = Pick<
+	DocumentListItem,
+	'id' | 'title' | 'documentDate' | 'metaDatePrecision' | 'metaDateEnd'
+>;
+
+interface Props {
+	alreadyAddedIds?: Set<string>;
+	onAddDocument: (doc: DocumentOption) => void;
+	onAddInterlude: (text: string) => void;
+}
+
+let { alreadyAddedIds = new Set(), onAddDocument, onAddInterlude }: Props = $props();
+
+let showPicker = $state(false);
+let showInterludeForm = $state(false);
+let interludeDraft = $state('');
+
+const canConfirmInterlude = $derived(interludeDraft.trim().length > 0);
+
+function handleDocumentSelect(doc: DocumentOption) {
+	showPicker = false;
+	onAddDocument(doc);
+}
+
+function handleInterludeConfirm() {
+	if (!canConfirmInterlude) return;
+	const text = interludeDraft.trim();
+	interludeDraft = '';
+	showInterludeForm = false;
+	onAddInterlude(text);
+}
+
+function handleInterludeCancel() {
+	interludeDraft = '';
+	showInterludeForm = false;
+}
+</script>
+
+<div class="flex flex-col gap-3">
+	<div class="flex flex-wrap gap-2">
+		<button
+			type="button"
+			onclick={() => {
+				showPicker = !showPicker;
+				showInterludeForm = false;
+			}}
+			class="inline-flex h-11 items-center rounded border border-line bg-surface px-4 font-sans text-sm font-medium text-ink hover:bg-muted focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+		>
+			+ {m.journey_add_document()}
+		</button>
+		<button
+			type="button"
+			onclick={() => {
+				showInterludeForm = !showInterludeForm;
+				showPicker = false;
+			}}
+			class="inline-flex h-11 items-center rounded border border-line bg-surface px-4 font-sans text-sm font-medium text-ink hover:bg-muted focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+		>
+			+ {m.journey_add_interlude()}
+		</button>
+	</div>
+
+	{#if showPicker}
+		<DocumentPickerDropdown
+			alreadyAddedIds={alreadyAddedIds}
+			onSelect={handleDocumentSelect}
+			placeholder={m.journey_add_document()}
+		/>
+	{/if}
+
+	{#if showInterludeForm}
+		<div class="flex flex-col gap-2">
+			<textarea
+				bind:value={interludeDraft}
+				placeholder={m.journey_interlude_placeholder()}
+				rows={3}
+				maxlength={2000}
+				class="block w-full resize-y rounded border border-line bg-surface px-3 py-2 font-sans text-sm text-ink placeholder:text-ink-3 focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+			></textarea>
+			<div class="flex gap-2">
+				<button
+					type="button"
+					onclick={handleInterludeConfirm}
+					aria-disabled={!canConfirmInterlude}
+					class={[
+						'inline-flex h-11 items-center rounded px-4 font-sans text-sm font-medium focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring',
+						canConfirmInterlude
+							? 'bg-primary text-primary-fg hover:opacity-90'
+							: 'cursor-not-allowed bg-primary/40 text-primary-fg/60'
+					].join(' ')}
+				>
+					{m.journey_add_interlude_confirm()}
+				</button>
+				<button
+					type="button"
+					onclick={handleInterludeCancel}
+					class="inline-flex h-11 items-center rounded border border-line bg-surface px-4 font-sans text-sm font-medium text-ink hover:bg-muted focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
+				>
+					{m.journey_remove_confirm_cancel()}
+				</button>
+			</div>
+		</div>
+	{/if}
+</div>

frontend/src/lib/geschichte/JourneyAddBar.svelte.spec.ts

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+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page, userEvent } from 'vitest/browser';
+import JourneyAddBar from './JourneyAddBar.svelte';
+
+afterEach(() => cleanup());
+
+describe('JourneyAddBar — interlude flow', () => {
+	it('interlude confirm button is aria-disabled until text is non-empty', async () => {
+		render(JourneyAddBar, { onAddDocument: vi.fn(), onAddInterlude: vi.fn() });
+
+		await userEvent.click(page.getByText('Zwischentext hinzufügen'));
+
+		const confirmBtn = page.getByRole('button', { name: 'Hinzufügen' });
+		await expect.element(confirmBtn).toHaveAttribute('aria-disabled', 'true');
+	});
+
+	it('confirm becomes active after typing text', async () => {
+		render(JourneyAddBar, { onAddDocument: vi.fn(), onAddInterlude: vi.fn() });
+
+		await userEvent.click(page.getByText('Zwischentext hinzufügen'));
+		await userEvent.fill(page.getByRole('textbox'), 'Eine schöne Reise');
+
+		const confirmBtn = page.getByRole('button', { name: 'Hinzufügen' });
+		await expect.element(confirmBtn).toHaveAttribute('aria-disabled', 'false');
+	});
+
+	it('calls onAddInterlude with text on confirm', async () => {
+		const onAddInterlude = vi.fn();
+		render(JourneyAddBar, { onAddDocument: vi.fn(), onAddInterlude });
+
+		await userEvent.click(page.getByText('Zwischentext hinzufügen'));
+		await userEvent.fill(page.getByRole('textbox'), 'Reise nach Wien');
+		await userEvent.click(page.getByRole('button', { name: 'Hinzufügen' }));
+
+		expect(onAddInterlude).toHaveBeenCalledWith('Reise nach Wien');
+	});
+});
+
+describe('JourneyAddBar — document picker', () => {
+	it('reveals picker when "Brief hinzufügen" is clicked', async () => {
+		vi.stubGlobal(
+			'fetch',
+			vi.fn().mockResolvedValue({ ok: true, json: vi.fn().mockResolvedValue({ items: [] }) })
+		);
+		render(JourneyAddBar, { onAddDocument: vi.fn(), onAddInterlude: vi.fn() });
+
+		await userEvent.click(page.getByText('Brief hinzufügen'));
+
+		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
+		vi.unstubAllGlobals();
+	});
+});