Adds comprehensive customer detail view components

Implements full customer detail page with multiple feature-rich components including overview, economy, statistics, journal, appointments, giftcards, and activity sections

Creates reusable ViewComponents for different customer detail aspects with robust data modeling and presentation logic

PlanTempus.Application/Features/Localization/Translations/en.json

@@ -656,8 +656,52 @@
       "seeAllNotes": "See all notes →"
     },
     "detail": {
+      "back": "Back to customers",
+      "delete": "Delete customer",
+      "save": "Save",
       "tabs": {
+        "overview": "Overview",
+        "economy": "Economy",
+        "statistics": "Statistics",
+        "journal": "Journal",
+        "appointments": "Appointments",
+        "giftcards": "Gift cards",
         "activitylog": "Activity log"
+      },
+      "visits": "visits",
+      "interval": "days interval",
+      "preferredHairdresser": "preferred hairdresser",
+      "totalRevenue": "total revenue",
+      "bookingAllowed": "Booking allowed",
+      "bookingBlocked": "Booking blocked",
+      "contactInfo": "Contact information",
+      "phone": "Phone",
+      "email": "Email",
+      "address": "Address",
+      "zipCity": "Zip + City",
+      "profile": "Profile",
+      "marketing": "Marketing",
+      "emailMarketing": "Email marketing",
+      "smsMarketing": "SMS marketing",
+      "paymentSettings": "Payment settings",
+      "requirePrepayment": "Require prepayment",
+      "allowPartialPayment": "Allow partial payment",
+      "preferences": "Preferences",
+      "preferredDay": "Preferred day",
+      "specialRequests": "Special requests",
+      "warnings": "Warnings",
+      "groupAndRelations": "Customer group & Relations",
+      "economy": {
+        "thisYear": "This year ({0})",
+        "lastYear": "Last year",
+        "avgPerVisit": "Avg. per visit",
+        "avgPerMonth": "Avg. per month",
+        "revenueOverTime": "Revenue over time",
+        "services": "Services",
+        "products": "Products",
+        "purchaseHistory": "Purchase history",
+        "seeAll": "See all transactions",
+        "noData": "No economic data available"
       }
     }
   }