refactor(shared): move FieldLabelBadge primitive to shared/primitives

FieldLabelBadge is a generic UI primitive (additive/replace badge used in form
field labels). It lived in the document domain but was already imported by
PersonTypeahead (person domain), creating a person → document coupling.
Moving it to shared/primitives eliminates that cross-domain dependency.

Refs #410
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/document/DescriptionSection.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 import { onMount } from 'svelte';
 import TagInput, { type Tag } from '$lib/tag/TagInput.svelte';
-import FieldLabelBadge from './FieldLabelBadge.svelte';
+import FieldLabelBadge from '$lib/shared/primitives/FieldLabelBadge.svelte';
 import { m } from '$lib/paraglide/messages.js';
 
 let {

frontend/src/lib/document/WhoWhenSection.svelte

@@ -2,7 +2,7 @@
 import { onMount, untrack } from 'svelte';
 import PersonTypeahead from '$lib/person/PersonTypeahead.svelte';
 import PersonMultiSelect from '$lib/person/PersonMultiSelect.svelte';
-import FieldLabelBadge from './FieldLabelBadge.svelte';
+import FieldLabelBadge from '$lib/shared/primitives/FieldLabelBadge.svelte';
 import { isoToGerman, handleGermanDateInput } from '$lib/shared/utils/date';
 import { m } from '$lib/paraglide/messages.js';
 import type { components } from '$lib/generated/api';

frontend/src/lib/person/PersonTypeahead.svelte

@@ -4,7 +4,7 @@ import type { components } from '$lib/generated/api';
 import { m } from '$lib/paraglide/messages.js';
 import { clickOutside } from '$lib/shared/actions/clickOutside';
 import { createTypeahead } from '$lib/shared/hooks/useTypeahead.svelte';
-import FieldLabelBadge from '$lib/document/FieldLabelBadge.svelte';
+import FieldLabelBadge from '$lib/shared/primitives/FieldLabelBadge.svelte';
 type Person = components['schemas']['Person'];
 
 interface Props {