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>