[split-required] Split 500-1000 LOC files across all services

backend-lehrer (5 files):
- alerts_agent/db/repository.py (992 → 5), abitur_docs_api.py (956 → 3)
- teacher_dashboard_api.py (951 → 3), services/pdf_service.py (916 → 3)
- mail/mail_db.py (987 → 6)

klausur-service (5 files):
- legal_templates_ingestion.py (942 → 3), ocr_pipeline_postprocess.py (929 → 4)
- ocr_pipeline_words.py (876 → 3), ocr_pipeline_ocr_merge.py (616 → 2)
- KorrekturPage.tsx (956 → 6)

website (5 pages):
- mail (985 → 9), edu-search (958 → 8), mac-mini (950 → 7)
- ocr-labeling (946 → 7), audit-workspace (871 → 4)

studio-v2 (5 files + 1 deleted):
- page.tsx (946 → 5), MessagesContext.tsx (925 → 4)
- korrektur (914 → 6), worksheet-cleanup (899 → 6)
- useVocabWorksheet.ts (888 → 3)
- Deleted dead page-original.tsx (934 LOC)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

studio-v2/lib/messages/helpers.ts

@@ -0,0 +1,69 @@
+import type { Contact } from './types'
+
+export function formatMessageTime(timestamp: string): string {
+  const date = new Date(timestamp)
+  const now = new Date()
+  const diffMs = now.getTime() - date.getTime()
+  const diffMins = Math.floor(diffMs / 60000)
+  const diffHours = Math.floor(diffMs / 3600000)
+  const diffDays = Math.floor(diffMs / 86400000)
+
+  if (diffMins < 1) return 'Gerade eben'
+  if (diffMins < 60) return `${diffMins} Min.`
+  if (diffHours < 24) return `${diffHours} Std.`
+  if (diffDays === 1) return 'Gestern'
+  if (diffDays < 7) return `${diffDays} Tage`
+
+  return date.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit' })
+}
+
+export function formatMessageDate(timestamp: string): string {
+  const date = new Date(timestamp)
+  const now = new Date()
+  const diffDays = Math.floor((now.getTime() - date.getTime()) / 86400000)
+
+  if (diffDays === 0) return 'Heute'
+  if (diffDays === 1) return 'Gestern'
+  if (diffDays < 7) {
+    return date.toLocaleDateString('de-DE', { weekday: 'long' })
+  }
+
+  return date.toLocaleDateString('de-DE', { day: '2-digit', month: 'long', year: 'numeric' })
+}
+
+export function getContactInitials(name: string): string {
+  const parts = name.split(' ').filter(p => p.length > 0)
+  if (parts.length >= 2) {
+    return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase()
+  }
+  return name.slice(0, 2).toUpperCase()
+}
+
+export function getRoleLabel(role: Contact['role']): string {
+  const labels: Record<Contact['role'], string> = {
+    parent: 'Eltern',
+    teacher: 'Lehrkraft',
+    staff: 'Verwaltung',
+    student: 'Schueler/in'
+  }
+  return labels[role] || role
+}
+
+export function getRoleColor(role: Contact['role'], isDark: boolean): string {
+  const colors: Record<Contact['role'], { dark: string; light: string }> = {
+    parent: { dark: 'bg-blue-500/20 text-blue-300', light: 'bg-blue-100 text-blue-700' },
+    teacher: { dark: 'bg-purple-500/20 text-purple-300', light: 'bg-purple-100 text-purple-700' },
+    staff: { dark: 'bg-amber-500/20 text-amber-300', light: 'bg-amber-100 text-amber-700' },
+    student: { dark: 'bg-green-500/20 text-green-300', light: 'bg-green-100 text-green-700' }
+  }
+  return isDark ? colors[role].dark : colors[role].light
+}
+
+// Emoji categories for picker
+export const emojiCategories = {
+  'Häufig': ['👍', '❤️', '😊', '😂', '🙏', '👏', '🎉', '✅', '📝', '📚'],
+  'Smileys': ['😀', '😃', '😄', '😁', '😅', '😂', '🤣', '😊', '😇', '🙂', '😉', '😌', '😍', '🥰', '😘'],
+  'Gesten': ['👍', '👎', '👌', '✌️', '🤞', '🤝', '👏', '🙌', '👋', '✋', '🤚', '🖐️', '🙏'],
+  'Symbole': ['❤️', '💙', '💚', '💛', '🧡', '💜', '✅', '❌', '⭐', '🌟', '💯', '📌', '📎'],
+  'Schule': ['📚', '📖', '📝', '✏️', '📓', '📕', '📗', '📘', '🎓', '🏫', '📅', '⏰', '🔔']
+}