refactor(document): move MissionControlStrip to document domain

MissionControlStrip is a document-processing pipeline visualiser — it
imports document-domain components (SegmentationColumn, TranscriptionColumn,
ReadyColumn) and belongs in the document domain. It was placed in
shared/dashboard, creating a shared → document coupling that the upcoming
boundaries rule would block.

Refs #410
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/document/MissionControlStrip.svelte

@@ -0,0 +1,33 @@
+<script lang="ts">
+import * as m from '$lib/paraglide/messages.js';
+import type { components } from '$lib/generated/api';
+import SegmentationColumn from '$lib/document/SegmentationColumn.svelte';
+import TranscriptionColumn from '$lib/document/transcription/TranscriptionColumn.svelte';
+import ReadyColumn from '$lib/document/ReadyColumn.svelte';
+
+type TranscriptionQueueItemDTO = components['schemas']['TranscriptionQueueItemDTO'];
+type TranscriptionWeeklyStatsDTO = components['schemas']['TranscriptionWeeklyStatsDTO'];
+
+interface Props {
+	segmentationDocs: TranscriptionQueueItemDTO[];
+	transcriptionDocs: TranscriptionQueueItemDTO[];
+	readyDocs: TranscriptionQueueItemDTO[];
+	weeklyStats: TranscriptionWeeklyStatsDTO | null;
+}
+
+let { segmentationDocs, transcriptionDocs, readyDocs, weeklyStats }: Props = $props();
+</script>
+
+<section class="mt-4 rounded-sm border border-line bg-surface p-6">
+	<h2 class="mb-4 font-sans text-xs font-bold tracking-widest text-ink-3 uppercase">
+		{m.mission_control_heading()}
+	</h2>
+	<div class="grid grid-cols-1 gap-4 sm:grid-cols-3">
+		<SegmentationColumn docs={segmentationDocs} weeklyCount={weeklyStats?.segmentationCount ?? 0} />
+		<TranscriptionColumn
+			docs={transcriptionDocs}
+			weeklyCount={weeklyStats?.transcriptionCount ?? 0}
+		/>
+		<ReadyColumn docs={readyDocs} />
+	</div>
+</section>

frontend/src/lib/document/MissionControlStrip.svelte.spec.ts

@@ -0,0 +1,107 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import MissionControlStrip from './MissionControlStrip.svelte';
+import type { components } from '$lib/generated/api';
+
+type TranscriptionQueueItemDTO = components['schemas']['TranscriptionQueueItemDTO'];
+type TranscriptionWeeklyStatsDTO = components['schemas']['TranscriptionWeeklyStatsDTO'];
+
+afterEach(cleanup);
+
+function makeDoc(
+	id: string,
+	title: string,
+	overrides: Partial<TranscriptionQueueItemDTO> = {}
+): TranscriptionQueueItemDTO {
+	return {
+		id,
+		title,
+		annotationCount: 0,
+		textedBlockCount: 0,
+		reviewedBlockCount: 0,
+		contributors: [],
+		hasMoreContributors: false,
+		...overrides
+	};
+}
+
+const emptyStats: TranscriptionWeeklyStatsDTO = {
+	segmentationCount: 0,
+	transcriptionCount: 0,
+	readyCount: 0
+};
+
+describe('MissionControlStrip', () => {
+	it('renders section heading always', async () => {
+		render(MissionControlStrip, {
+			props: {
+				segmentationDocs: [],
+				transcriptionDocs: [],
+				readyDocs: [],
+				weeklyStats: null
+			}
+		});
+
+		await expect.element(page.getByText('Was braucht Aufmerksamkeit?')).toBeInTheDocument();
+	});
+
+	it('renders all three column headings', async () => {
+		render(MissionControlStrip, {
+			props: {
+				segmentationDocs: [makeDoc('s1', 'Seg Dok')],
+				transcriptionDocs: [makeDoc('t1', 'Trans Dok')],
+				readyDocs: [makeDoc('r1', 'Ready Dok')],
+				weeklyStats: emptyStats
+			}
+		});
+
+		await expect.element(page.getByText('Text markieren')).toBeInTheDocument();
+		await expect.element(page.getByText('Text transkribieren')).toBeInTheDocument();
+		await expect.element(page.getByText(/Lesefertig/)).toBeInTheDocument();
+	});
+
+	it('renders document titles in correct columns', async () => {
+		const segDoc = makeDoc('seg-1', 'Segmentierungs Brief');
+		const transDoc = makeDoc('trans-1', 'Transkriptions Postkarte');
+		const readyDoc = makeDoc('ready-1', 'Fertiger Tagebucheintrag');
+
+		render(MissionControlStrip, {
+			props: {
+				segmentationDocs: [segDoc],
+				transcriptionDocs: [transDoc],
+				readyDocs: [readyDoc],
+				weeklyStats: emptyStats
+			}
+		});
+
+		await expect.element(page.getByText('Segmentierungs Brief')).toBeInTheDocument();
+		await expect.element(page.getByText('Transkriptions Postkarte')).toBeInTheDocument();
+		await expect.element(page.getByText('Fertiger Tagebucheintrag')).toBeInTheDocument();
+	});
+
+	it('renders section heading even when all arrays are empty and weeklyStats is null', async () => {
+		render(MissionControlStrip, {
+			props: {
+				segmentationDocs: [],
+				transcriptionDocs: [],
+				readyDocs: [],
+				weeklyStats: null
+			}
+		});
+
+		// Heading always visible
+		await expect.element(page.getByText('Was braucht Aufmerksamkeit?')).toBeInTheDocument();
+
+		// All three empty states should also be visible
+		await expect
+			.element(page.getByText('Alle Dokumente haben bereits Segmentierungsblöcke.'))
+			.toBeInTheDocument();
+		await expect
+			.element(page.getByText('Keine Dokumente warten auf Transkription.'))
+			.toBeInTheDocument();
+		await expect
+			.element(page.getByText('Noch keine Dokumente vollständig transkribiert.'))
+			.toBeInTheDocument();
+	});
+});