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/lib/shared/discussion/CommentMessage.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 import { m } from '$lib/paraglide/messages.js';
-import type { FlatMessage } from '$lib/types';
+import type { FlatMessage } from '$lib/shared/types';
 import { extractQuote } from '$lib/shared/discussion/comment';
 import { getInitials } from '$lib/person/personFormat';
 import { relativeTime } from '$lib/shared/utils/time';

frontend/src/lib/shared/discussion/CommentMessage.svelte.spec.ts

@@ -2,7 +2,7 @@ import { describe, it, expect, vi, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page, userEvent } from 'vitest/browser';
 import CommentMessage from './CommentMessage.svelte';
-import type { FlatMessage } from '$lib/types';
+import type { FlatMessage } from '$lib/shared/types';
 
 afterEach(cleanup);
 

frontend/src/lib/shared/discussion/CommentThread.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 import { onMount, untrack } from 'svelte';
 import { m } from '$lib/paraglide/messages.js';
-import type { Comment, FlatMessage, MentionDTO } from '$lib/types';
+import type { Comment, FlatMessage, MentionDTO } from '$lib/shared/types';
 import MentionEditor from '$lib/shared/discussion/MentionEditor.svelte';
 import CommentMessage from '$lib/shared/discussion/CommentMessage.svelte';
 import { extractContent } from '$lib/shared/discussion/mention';

frontend/src/lib/shared/discussion/CommentThread.svelte.spec.ts

@@ -2,7 +2,7 @@ import { describe, it, expect, vi, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
 import { page } from 'vitest/browser';
 import CommentThread from './CommentThread.svelte';
-import type { Comment } from '$lib/types';
+import type { Comment } from '$lib/shared/types';
 
 afterEach(() => {
 	cleanup();

frontend/src/lib/shared/discussion/MentionEditor.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 import { onDestroy, tick } from 'svelte';
 import { detectMention } from '$lib/shared/discussion/mention';
-import type { MentionDTO } from '$lib/types';
+import type { MentionDTO } from '$lib/shared/types';
 import { m } from '$lib/paraglide/messages.js';
 
 type Props = {

frontend/src/lib/shared/discussion/PersonMentionEditor.svelte

@@ -5,7 +5,7 @@ import StarterKit from '@tiptap/starter-kit';
 import { Mention } from '@tiptap/extension-mention';
 import { m } from '$lib/paraglide/messages.js';
 import type { components } from '$lib/generated/api';
-import type { PersonMention } from '$lib/types';
+import type { PersonMention } from '$lib/shared/types';
 import { deserialize, serialize } from '$lib/shared/discussion/mentionSerializer';
 import MentionDropdown from './MentionDropdown.svelte';
 

frontend/src/lib/shared/discussion/mention.spec.ts

@@ -6,7 +6,7 @@ import {
 	renderBody,
 	renderTranscriptionBody
 } from './mention';
-import type { MentionDTO, PersonMention } from '$lib/types';
+import type { MentionDTO, PersonMention } from '$lib/shared/types';
 
 // ─── escapeHtml ───────────────────────────────────────────────────────────────
 

frontend/src/lib/shared/discussion/mention.ts

@@ -1,4 +1,4 @@
-import type { MentionDTO, PersonMention } from '$lib/types';
+import type { MentionDTO, PersonMention } from '$lib/shared/types';
 
 /**
  * Single-source CSS selector for rendered person-mention anchors. Used by:

frontend/src/lib/shared/discussion/mentionSerializer.spec.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect } from 'vitest';
 import { deserialize, serialize } from './mentionSerializer';
-import type { PersonMention } from '$lib/types';
+import type { PersonMention } from '$lib/shared/types';
 
 // ─── deserialize ─────────────────────────────────────────────────────────────
 

frontend/src/lib/shared/discussion/mentionSerializer.ts

@@ -1,5 +1,5 @@
 import type { JSONContent } from '@tiptap/core';
-import type { PersonMention } from '$lib/types';
+import type { PersonMention } from '$lib/shared/types';
 
 /**
  * Converts stored block text + sidecar into a Tiptap ProseMirror document.