Merge lane/planung in feature/craftvia-mvp

Konflikte gelöst (additiv): Benachrichtigungstexte (Zeiterfassung + Planung, JSON zusammengeführt),
Event-Typen, Navigation, Empfänger-Felder, handle-event (reason inkl. rejectionReason + Planungsfelder),
Smoke-Prüfungen (Teamleiter: Zeiten + Planung).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

messages/en/nav.json

@@ -1,6 +1,9 @@
 {
   "dashboard": "Dashboard",
   "workOrders": "Work orders",
+  "planning": "Planning",
+  "planningBoard": "Planning board",
+  "planningLive": "Live situation",
   "emergencyReview": "Emergency review",
   "imports": "Import",
   "customers": "Customers",