refactor(document): move statusDotClass and statusLabel to document domain

These functions describe DocumentStatus display logic (dot colours, readable
labels) and belong in the document domain. They were incorrectly placed in
personFormat.ts. Moving them to documentStatusLabel.ts removes the
person → document dependency and prepares the codebase for the
boundaries/dependencies ESLint rule.

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

frontend/src/lib/document/documentStatusLabel.spec.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { formatDocumentStatus } from './documentStatusLabel';
+import { formatDocumentStatus, statusDotClass, statusLabel } from './documentStatusLabel';
 
 describe('formatDocumentStatus', () => {
 	it('maps PLACEHOLDER to correct label', () => {
@@ -26,3 +26,47 @@ describe('formatDocumentStatus', () => {
 		expect(formatDocumentStatus('SOMETHING_NEW')).toBe('Unbekannt');
 	});
 });
+
+describe('statusDotClass', () => {
+	it('PLACEHOLDER → bg-gray-400', () => {
+		expect(statusDotClass('PLACEHOLDER')).toBe('bg-gray-400');
+	});
+
+	it('UPLOADED → bg-emerald-500', () => {
+		expect(statusDotClass('UPLOADED')).toBe('bg-emerald-500');
+	});
+
+	it('TRANSCRIBED → bg-blue-400', () => {
+		expect(statusDotClass('TRANSCRIBED')).toBe('bg-blue-400');
+	});
+
+	it('REVIEWED → bg-amber-400', () => {
+		expect(statusDotClass('REVIEWED')).toBe('bg-amber-400');
+	});
+
+	it('ARCHIVED → bg-emerald-600', () => {
+		expect(statusDotClass('ARCHIVED')).toBe('bg-emerald-600');
+	});
+});
+
+describe('statusLabel', () => {
+	it('PLACEHOLDER → "Platzhalter"', () => {
+		expect(statusLabel('PLACEHOLDER')).toBe('Platzhalter');
+	});
+
+	it('UPLOADED → "Hochgeladen"', () => {
+		expect(statusLabel('UPLOADED')).toBe('Hochgeladen');
+	});
+
+	it('TRANSCRIBED → "Transkribiert"', () => {
+		expect(statusLabel('TRANSCRIBED')).toBe('Transkribiert');
+	});
+
+	it('REVIEWED → "Geprüft"', () => {
+		expect(statusLabel('REVIEWED')).toBe('Geprüft');
+	});
+
+	it('ARCHIVED → "Archiviert"', () => {
+		expect(statusLabel('ARCHIVED')).toBe('Archiviert');
+	});
+});