refactor: move document domain core to lib/document/

Moves ~25 components, utils (search, filename, groupDocuments,
documentStatusLabel, validateFile), bulkSelection store, and
TranscriptionSection sub-component. Fixes broken relative imports.

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

frontend/src/lib/document/DocumentStatusChip.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+import { statusDotClass, statusLabel } from '$lib/utils/personFormat';
+
+type DocumentStatus = 'PLACEHOLDER' | 'UPLOADED' | 'TRANSCRIBED' | 'REVIEWED' | 'ARCHIVED';
+
+type Props = {
+	status: DocumentStatus;
+};
+
+let { status }: Props = $props();
+
+const dotClass = $derived(statusDotClass(status));
+const label = $derived(statusLabel(status));
+</script>
+
+<span
+	class="hidden shrink-0 md:block {dotClass} h-4 w-4 rounded-full"
+	title={label}
+	aria-label={label}
+></span>