Feature: Kilometerstand-Feld für Fahrräder und verbesserte Warnungen

- currentMileage Feld zu Bike-Modell hinzugefügt
- calculateServiceStatus verwendet jetzt aktuellen Kilometerstand des Fahrrads
- Warnungen für überfällige Wartungen (OVERDUE Status)
- Rote Warnung bei überfälligen Teilen
- Kilometerstand wird in BikeDetail und BikeCard angezeigt
- AlertBadge unterstützt jetzt critical Variante
- Verbesserte Statusanzeige mit Überfällig-Hinweis

lib/utils.ts

@@ -1,20 +1,26 @@
 import { WearPart, MaintenanceHistory } from '@prisma/client'
 
 export function calculateServiceStatus(
-  part: WearPart & { maintenanceHistory: MaintenanceHistory[] }
+  part: WearPart & { maintenanceHistory: MaintenanceHistory[] },
+  bikeCurrentMileage?: number
 ): {
-  status: 'OK' | 'WARNING' | 'CRITICAL'
+  status: 'OK' | 'WARNING' | 'CRITICAL' | 'OVERDUE'
   remainingKm: number
   percentageUsed: number
+  isOverdue: boolean
 } {
+  // Use bike's current mileage if provided, otherwise use latest maintenance mileage
   const latestMaintenance = part.maintenanceHistory[0]
-  const currentMileage = latestMaintenance?.mileage ?? part.installMileage
+  const currentMileage = bikeCurrentMileage ?? (latestMaintenance?.mileage ?? part.installMileage)
   const kmSinceInstall = currentMileage - part.installMileage
   const remainingKm = part.serviceInterval - kmSinceInstall
   const percentageUsed = (kmSinceInstall / part.serviceInterval) * 100
+  const isOverdue = remainingKm < 0
 
-  let status: 'OK' | 'WARNING' | 'CRITICAL' = 'OK'
-  if (percentageUsed >= 90) {
+  let status: 'OK' | 'WARNING' | 'CRITICAL' | 'OVERDUE' = 'OK'
+  if (isOverdue) {
+    status = 'OVERDUE'
+  } else if (percentageUsed >= 90) {
     status = 'CRITICAL'
   } else if (percentageUsed >= 75) {
     status = 'WARNING'
@@ -23,7 +29,8 @@ export function calculateServiceStatus(
   return {
     status,
     remainingKm: Math.max(0, remainingKm),
-    percentageUsed: Math.min(100, percentageUsed),
+    percentageUsed: Math.min(100, Math.max(0, percentageUsed)),
+    isOverdue,
   }
 }
 

lib/validations.ts

@@ -66,6 +66,7 @@ export const bikeSchema = z.object({
     .refine((val) => val === undefined || val instanceof Date, {
       message: 'Ungültiges Datumsformat',
     }),
+  currentMileage: z.number().int().min(0).optional().default(0),
   notes: z.string().optional().transform((val) => val?.trim() || undefined),
 })