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/routes/+page.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 import DropZone from './DropZone.svelte';
 import DashboardResumeStrip from '$lib/shared/dashboard/DashboardResumeStrip.svelte';
-import MissionControlStrip from '$lib/shared/dashboard/MissionControlStrip.svelte';
+import MissionControlStrip from '$lib/document/MissionControlStrip.svelte';
 import DashboardFamilyPulse from '$lib/shared/dashboard/DashboardFamilyPulse.svelte';
 import DashboardActivityFeed from '$lib/activity/DashboardActivityFeed.svelte';
 import EnrichmentBlock from '$lib/document/EnrichmentBlock.svelte';