feat: Add employee assignment UI in order detail

- Add employees/subcontractors directly from order view
- Modal with selectable user list (checkmarks)
- Shows role badges (Mitarbeiter, Subunternehmer, etc)
- Remove assignments with trash icon
- i18n translations

src/views/OrderDetailView.vue

@@ -1,9 +1,11 @@
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
+import { useI18n } from 'vue-i18n'
 import { useAuthStore } from '@/stores/auth'
 import { api } from '@/api'
 
+const { t } = useI18n()
 const route = useRoute()
 const router = useRouter()
 const authStore = useAuthStore()
@@ -11,26 +13,95 @@ const authStore = useAuthStore()
 const order = ref<any>(null)
 const assignments = ref<any[]>([])
 const loading = ref(true)
+const showAssignModal = ref(false)
+const availableUsers = ref<any[]>([])
+const loadingUsers = ref(false)
+const selectedUsers = ref<string[]>([])
+const assigning = ref(false)
 
 onMounted(async () => {
+  await loadOrder()
+})
+
+async function loadOrder() {
   try {
     const res = await api.get<{ order: any; assignments: any[] }>(`/orders/${route.params.id}`)
     order.value = res.data.order
-    assignments.value = res.data.assignments
+    assignments.value = res.data.assignments || []
   } catch (e) {
     console.error(e)
     router.push('/orders')
   } finally {
     loading.value = false
   }
-})
+}
+
+async function loadAvailableUsers() {
+  loadingUsers.value = true
+  try {
+    const res = await api.get<{ users: any[] }>('/users')
+    // Filter out already assigned users
+    const assignedIds = assignments.value.map(a => a.user_id)
+    availableUsers.value = res.data.users.filter(u => 
+      !assignedIds.includes(u.id) && u.active
+    )
+  } catch (e) {
+    console.error(e)
+  } finally {
+    loadingUsers.value = false
+  }
+}
+
+function openAssignModal() {
+  selectedUsers.value = []
+  showAssignModal.value = true
+  loadAvailableUsers()
+}
+
+function toggleUserSelection(userId: string) {
+  const idx = selectedUsers.value.indexOf(userId)
+  if (idx > -1) {
+    selectedUsers.value.splice(idx, 1)
+  } else {
+    selectedUsers.value.push(userId)
+  }
+}
+
+async function assignSelectedUsers() {
+  if (selectedUsers.value.length === 0) return
+  
+  assigning.value = true
+  try {
+    // Assign each selected user
+    for (const userId of selectedUsers.value) {
+      await api.post(`/orders/${route.params.id}/assign`, { userId })
+    }
+    showAssignModal.value = false
+    await loadOrder()
+  } catch (e) {
+    alert(e instanceof Error ? e.message : t('messages.error'))
+  } finally {
+    assigning.value = false
+  }
+}
+
+async function removeAssignment(userId: string) {
+  if (!confirm(t('messages.confirmDelete'))) return
+  
+  try {
+    await api.delete(`/orders/${route.params.id}/assign/${userId}`)
+    await loadOrder()
+  } catch (e) {
+    alert(e instanceof Error ? e.message : t('messages.error'))
+  }
+}
 
 async function updateStatus(status: string) {
   try {
     await api.put(`/orders/${route.params.id}`, { status })
     order.value.status = status
   } catch (e) {
-    alert(e instanceof Error ? e.message : 'Fehler')
+    alert(e instanceof Error ? e.message : t('messages.error'))
   }
 }
 
@@ -44,27 +115,44 @@ async function confirmAssignment(confirm: boolean) {
       myAssignment.status = confirm ? 'confirmed' : 'declined'
     }
   } catch (e) {
-    alert(e instanceof Error ? e.message : 'Fehler')
+    alert(e instanceof Error ? e.message : t('messages.error'))
   }
 }
 
 function getStatusLabel(status: string) {
-  const labels: Record<string, string> = {
-    draft: 'Entwurf', published: 'Veröffentlicht', in_progress: 'In Bearbeitung',
-    completed: 'Abgeschlossen', cancelled: 'Abgesagt',
+  const key = `orders.statuses.${status}`
+  const translated = t(key)
+  if (translated !== key) return translated
+  
+  // Fallback for assignment statuses
+  const fallback: Record<string, string> = {
     pending: 'Ausstehend', confirmed: 'Bestätigt', declined: 'Abgelehnt'
   }
-  return labels[status] || status
+  return fallback[status] || status
 }
+
+function getRoleBadge(role: string) {
+  const badges: Record<string, { class: string; label: string }> = {
+    chef: { class: 'bg-purple-100 text-purple-700', label: 'Chef' },
+    disponent: { class: 'bg-blue-100 text-blue-700', label: 'Disponent' },
+    mitarbeiter: { class: 'bg-green-100 text-green-700', label: 'Mitarbeiter' },
+    subunternehmer: { class: 'bg-orange-100 text-orange-700', label: 'Subunternehmer' }
+  }
+  return badges[role] || { class: 'bg-gray-100 text-gray-700', label: role }
+}
+
+const spotsRemaining = computed(() => {
+  return (order.value?.required_staff || 0) - assignments.value.length
+})
 </script>
 
 <template>
-  <div v-if="loading" class="text-center py-12 text-gray-500">Lädt...</div>
+  <div v-if="loading" class="text-center py-12 text-gray-500">{{ t('app.loading') }}</div>
 
   <div v-else-if="order" class="space-y-6">
     <!-- Back button -->
     <router-link to="/orders" class="text-primary-600 hover:text-primary-700 text-sm">
-      ← Zurück zu Aufträge
+      ← {{ t('app.back') }}
     </router-link>
 
     <!-- Header -->
@@ -87,54 +175,83 @@ function getStatusLabel(status: string) {
       <!-- Info Grid -->
       <div class="grid grid-cols-2 md:grid-cols-4 gap-4 mt-6">
         <div v-if="order.location">
-          <p class="text-sm text-gray-500">Ort</p>
+          <p class="text-sm text-gray-500">{{ t('orders.location') }}</p>
           <p class="font-medium">📍 {{ order.location }}</p>
         </div>
         <div v-if="order.start_time">
-          <p class="text-sm text-gray-500">Start</p>
-          <p class="font-medium">{{ new Date(order.start_time).toLocaleString('de-DE') }}</p>
+          <p class="text-sm text-gray-500">{{ t('orders.startDate') }}</p>
+          <p class="font-medium">{{ new Date(order.start_time).toLocaleString() }}</p>
         </div>
         <div v-if="order.client_name">
-          <p class="text-sm text-gray-500">Kunde</p>
+          <p class="text-sm text-gray-500">{{ t('orders.client') }}</p>
           <p class="font-medium">{{ order.client_name }}</p>
         </div>
         <div>
-          <p class="text-sm text-gray-500">Benötigte MA</p>
-          <p class="font-medium">{{ assignments.length }}/{{ order.required_staff }}</p>
+          <p class="text-sm text-gray-500">{{ t('users.employees') }}</p>
+          <p class="font-medium">
+            {{ assignments.length }}/{{ order.required_staff }}
+            <span v-if="spotsRemaining > 0" class="text-orange-500 text-sm ml-1">
+              ({{ spotsRemaining }} {{ t('app.none') }})
+            </span>
+          </p>
         </div>
       </div>
 
       <!-- Status actions for management -->
       <div v-if="authStore.canManageOrders" class="mt-6 pt-6 border-t border-gray-200 dark:border-gray-700">
-        <p class="text-sm text-gray-500 mb-2">Status ändern:</p>
+        <p class="text-sm text-gray-500 mb-2">{{ t('app.status') }}:</p>
         <div class="flex flex-wrap gap-2">
-          <button class="btn btn-secondary text-sm" @click="updateStatus('draft')">Entwurf</button>
-          <button class="btn btn-primary text-sm" @click="updateStatus('published')">Veröffentlichen</button>
-          <button class="btn btn-warning text-sm" @click="updateStatus('in_progress')">In Bearbeitung</button>
-          <button class="btn btn-success text-sm" @click="updateStatus('completed')">Abschließen</button>
+          <button class="btn btn-secondary text-sm" @click="updateStatus('draft')">{{ t('orders.statuses.draft') }}</button>
+          <button class="btn btn-primary text-sm" @click="updateStatus('published')">{{ t('orders.statuses.published') }}</button>
+          <button class="btn btn-warning text-sm" @click="updateStatus('in_progress')">{{ t('orders.statuses.in_progress') }}</button>
+          <button class="btn btn-success text-sm" @click="updateStatus('completed')">{{ t('orders.statuses.completed') }}</button>
         </div>
       </div>
     </div>
 
     <!-- Assignments -->
     <div class="card">
-      <h2 class="text-lg font-semibold text-gray-900 dark:text-white mb-4">
-        👥 Zugewiesene Mitarbeiter
+      <div class="flex items-center justify-between mb-4">
+        <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+          👥 {{ t('orders.assignedTo') }}
         </h2>
+        <button 
+          v-if="authStore.canManageOrders"
+          @click="openAssignModal" 
+          class="btn btn-primary"
+        >
+          + {{ t('app.add') }}
+        </button>
+      </div>
 
-      <div v-if="assignments.length === 0" class="text-center py-4 text-gray-500">
-        Noch keine Mitarbeiter zugewiesen
+      <div v-if="assignments.length === 0" class="text-center py-8 text-gray-500">
+        <p class="text-4xl mb-2">👥</p>
+        <p>{{ t('messages.noData') }}</p>
+        <button 
+          v-if="authStore.canManageOrders"
+          @click="openAssignModal" 
+          class="btn btn-primary mt-4"
+        >
+          + {{ t('users.employee') }} {{ t('app.add') }}
+        </button>
       </div>
 
       <div v-else class="space-y-3">
         <div
           v-for="assignment in assignments"
           :key="assignment.id"
-          class="flex items-center justify-between p-3 bg-gray-50 dark:bg-gray-700/50 rounded-lg"
+          class="flex items-center justify-between p-4 bg-gray-50 dark:bg-gray-700/50 rounded-lg"
         >
+          <div class="flex items-center gap-4">
+            <div class="w-10 h-10 rounded-full bg-primary-100 dark:bg-primary-900 flex items-center justify-center">
+              <span class="text-primary-600 dark:text-primary-300 font-medium">
+                {{ assignment.user_name?.split(' ').map((n: string) => n[0]).join('') }}
+              </span>
+            </div>
             <div>
               <p class="font-medium text-gray-900 dark:text-white">{{ assignment.user_name }}</p>
-            <p class="text-sm text-gray-500">{{ assignment.user_phone }}</p>
+              <p class="text-sm text-gray-500">{{ assignment.user_phone || assignment.user_email }}</p>
+            </div>
           </div>
           <div class="flex items-center gap-2">
             <span :class="['badge', assignment.status === 'confirmed' ? 'badge-success' : assignment.status === 'declined' ? 'badge-danger' : 'badge-warning']">
@@ -146,6 +263,16 @@ function getStatusLabel(status: string) {
               <button class="btn btn-success text-sm" @click="confirmAssignment(true)">✓</button>
               <button class="btn btn-danger text-sm" @click="confirmAssignment(false)">✗</button>
             </template>
+            
+            <!-- Remove button for management -->
+            <button 
+              v-if="authStore.canManageOrders"
+              @click="removeAssignment(assignment.user_id)"
+              class="p-2 text-red-500 hover:bg-red-50 dark:hover:bg-red-900/20 rounded"
+              :title="t('app.delete')"
+            >
+              🗑️
+            </button>
           </div>
         </div>
       </div>
@@ -154,9 +281,77 @@ function getStatusLabel(status: string) {
     <!-- Special Instructions -->
     <div v-if="order.special_instructions" class="card">
       <h2 class="text-lg font-semibold text-gray-900 dark:text-white mb-2">
-        📝 Besondere Hinweise
+        📝 {{ t('app.notes') }}
       </h2>
       <p class="text-gray-600 dark:text-gray-400 whitespace-pre-wrap">{{ order.special_instructions }}</p>
     </div>
+
+    <!-- Assign Users Modal -->
+    <div v-if="showAssignModal" class="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
+      <div class="bg-white dark:bg-gray-800 rounded-lg shadow-xl w-full max-w-lg mx-4 max-h-[80vh] flex flex-col">
+        <div class="p-4 border-b dark:border-gray-700">
+          <h2 class="text-xl font-semibold">👥 {{ t('users.employee') }} {{ t('app.add') }}</h2>
+          <p class="text-sm text-gray-500 mt-1">
+            {{ t('users.employees') }}: {{ selectedUsers.length }} {{ t('app.add') }}
+          </p>
+        </div>
+        
+        <div class="flex-1 overflow-y-auto p-4">
+          <div v-if="loadingUsers" class="text-center py-8 text-gray-500">
+            {{ t('app.loading') }}
+          </div>
+          
+          <div v-else-if="availableUsers.length === 0" class="text-center py-8 text-gray-500">
+            <p class="text-4xl mb-2">😕</p>
+            <p>{{ t('messages.noData') }}</p>
+          </div>
+          
+          <div v-else class="space-y-2">
+            <button
+              v-for="user in availableUsers"
+              :key="user.id"
+              @click="toggleUserSelection(user.id)"
+              :class="[
+                'w-full flex items-center gap-4 p-3 rounded-lg transition-colors text-left',
+                selectedUsers.includes(user.id) 
+                  ? 'bg-primary-100 dark:bg-primary-900/50 border-2 border-primary-500' 
+                  : 'bg-gray-50 dark:bg-gray-700/50 hover:bg-gray-100 dark:hover:bg-gray-700 border-2 border-transparent'
+              ]"
+            >
+              <div class="w-10 h-10 rounded-full bg-gray-200 dark:bg-gray-600 flex items-center justify-center flex-shrink-0">
+                <span class="font-medium text-gray-600 dark:text-gray-300">
+                  {{ user.first_name?.[0] }}{{ user.last_name?.[0] }}
+                </span>
+              </div>
+              <div class="flex-1 min-w-0">
+                <p class="font-medium text-gray-900 dark:text-white">
+                  {{ user.first_name }} {{ user.last_name }}
+                </p>
+                <p class="text-sm text-gray-500 truncate">{{ user.email }}</p>
+              </div>
+              <div class="flex items-center gap-2">
+                <span :class="['px-2 py-0.5 rounded text-xs', getRoleBadge(user.role).class]">
+                  {{ getRoleBadge(user.role).label }}
+                </span>
+                <span v-if="selectedUsers.includes(user.id)" class="text-primary-600 text-xl">✓</span>
+              </div>
+            </button>
+          </div>
+        </div>
+        
+        <div class="p-4 border-t dark:border-gray-700 flex gap-3">
+          <button @click="showAssignModal = false" class="btn flex-1">
+            {{ t('app.cancel') }}
+          </button>
+          <button 
+            @click="assignSelectedUsers" 
+            :disabled="selectedUsers.length === 0 || assigning"
+            class="btn btn-primary flex-1"
+          >
+            {{ assigning ? t('app.loading') : `${selectedUsers.length} ${t('app.add')}` }}
+          </button>
+        </div>
+      </div>
+    </div>
   </div>
 </template>