fix(dashboard): resolve tutorial QA notes (clips 2–6)

- settings/company: show success toast on save (2.1)
- inspection templates: add explicit Save button (2.6)
- parts: label price fields with AED currency (3.1)
- service groups: add parts/services picker to packages (3.3)
- vehicles: add insurance (has_insurance + insurance type) field (4.2)
- appointments: add calendar view with list/calendar toggle (5.1)
- job card check-in: require department (5.4)
- job card payments: refresh job card/invoice queries so PAID shows (5.6)
- vendors: add phone + address fields (6.1)
- bill payments: surface real vendor/employee validation errors (6.4)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/dashboard/modules/payment-mades/payment-made-form.tsx

@@ -213,21 +213,24 @@ export function PaymentMadeForm({ resourceId, initialData, onSuccess, billId, ex
                 return
             }
 
-            const vendorError = error.validationErrors.vendor_id?.[0]
-            const employeeError = error.validationErrors.employee_id?.[0]
-            const billError = error.validationErrors.bill_id?.[0]
+            // Surface the actual backend validation messages on each field
+            // instead of blanket-replacing them with the "not both" message —
+            // that masked unrelated errors and showed the wrong text when only
+            // one of vendor/employee was selected.
+            const errors = error.validationErrors
+            const billError = errors.bill_id?.[0]
+            const vendorError = errors.vendor_id?.[0]
+            const employeeError = errors.employee_id?.[0]
 
             if (billError) {
                 form.setError("bill", { message: billError })
             }
-
-            if (!vendorError && !employeeError) {
-                return
+            if (vendorError) {
+                form.setError("vendor", { message: vendorError })
+            }
+            if (employeeError) {
+                form.setError("employee", { message: employeeError })
             }
-
-            const message = "Select either a vendor or an employee, not both"
-            form.setError("vendor", { message })
-            form.setError("employee", { message })
         },
         onSuccess: () => {
             form.reset()