feat(#240): Mission Control Strip frontend — 5 components + dashboard wiring

Adds the full-width 3-column collaboration widget below the existing
dashboard grid. Renders without the backend running (Promise.allSettled
isolation keeps failures silent).

Components (src/lib/components/):
- ExpertBadge.svelte — purple pill with icon, no props
- SegmentationColumn.svelte — col 1: links to /enrich/{id}, weekly pulse
- TranscriptionColumn.svelte — col 2: per-doc progress bar when blocks exist
- ReadyColumn.svelte — col 3: mint border when filled, dashed empty state
- MissionControlStrip.svelte — strip wrapper, 1-col mobile / 3-col sm+

i18n: 19 new keys added to de/en/es (mission_control_*)

Page wiring:
- +page.server.ts: 4 new Promise.allSettled calls for segmentation-queue,
  transcription-queue, ready-to-read, weekly-stats; all failures silent
- +page.svelte: MissionControlStrip rendered below the grid in isDashboard

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

frontend/src/routes/+page.svelte

@@ -9,6 +9,7 @@ import DocumentList from './DocumentList.svelte';
 import DashboardResumeStrip from '$lib/components/DashboardResumeStrip.svelte';
 import DashboardNeedsMetadata from '$lib/components/DashboardNeedsMetadata.svelte';
 import DashboardRecentDocuments from '$lib/components/DashboardRecentDocuments.svelte';
+import MissionControlStrip from '$lib/components/MissionControlStrip.svelte';
 import { m } from '$lib/paraglide/messages.js';
 
 let { data } = $props();
@@ -132,6 +133,13 @@ const showRightColumn = $derived(data.canWrite || (data.incompleteDocs?.length ?
 
 			<DashboardRecentDocuments recentDocs={data.recentDocs ?? []} stats={data.stats} />
 		</div>
+
+		<MissionControlStrip
+			segmentationDocs={data.segmentationDocs ?? []}
+			transcriptionDocs={data.transcriptionDocs ?? []}
+			readyDocs={data.readyDocs ?? []}
+			weeklyStats={data.weeklyStats ?? null}
+		/>
 	{:else}
 		<DocumentList
 			documents={data.documents ?? []}