refactor: move lib-root files to lib/shared/ and finalize domain structure

- Move api.server.ts, errors.ts, types.ts, utils.ts, relativeTime.ts to lib/shared/
- Move person relationship components to lib/person/relationship/
- Move Stammbaum components to lib/person/genealogy/
- Move HelpPopover to lib/shared/primitives/
- Update all import paths across routes, specs, and lib files
- Update vi.mock() paths in server-project test files
- Remove now-empty legacy directories (components/, hooks/, server/, etc.)
- Update vite.config.ts coverage include paths for new structure
- Update frontend/CLAUDE.md to reflect domain-based lib/ layout

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

frontend/src/routes/documents/[id]/+page.svelte

@@ -8,8 +8,8 @@ import DocumentViewer from '$lib/document/DocumentViewer.svelte';
 import TranscriptionEditView from '$lib/document/transcription/TranscriptionEditView.svelte';
 import TranscriptionReadView from '$lib/document/transcription/TranscriptionReadView.svelte';
 import TranscriptionPanelHeader from '$lib/document/transcription/TranscriptionPanelHeader.svelte';
-import type { TranscriptionBlockData } from '$lib/types';
-import { getErrorMessage } from '$lib/errors';
+import type { TranscriptionBlockData } from '$lib/shared/types';
+import { getErrorMessage } from '$lib/shared/errors';
 import { translateOcrProgress } from '$lib/ocr/translateOcrProgress';
 import { createFileLoader } from '$lib/document/viewer/useFileLoader.svelte';
 import { scrollToCommentFromQuery } from '$lib/shared/utils/deepLinkScroll';
@@ -91,7 +91,7 @@ async function loadTranscriptionBlocks() {
 async function saveBlock(
 	blockId: string,
 	text: string,
-	mentionedPersons: import('$lib/types').PersonMention[]
+	mentionedPersons: import('$lib/shared/types').PersonMention[]
 ) {
 	const { saveBlockWithConflictRetry } =
 		await import('$lib/document/transcription/saveBlockWithConflictRetry');