fix: ispravljen prikaz Vozilo servisera u WorkOrderDetailModal

- Vozilo servisera sada prikazuje servicer_vehicle_* polja (registracija,
  marka/model, km start/end, trosak goriva) umjesto craneInfo podataka
- start_mileage/end_mileage (km dizalice na nalogu) premjesteni u Podaci dizalice
- servicer_vehicle_* polja dodana u form state, useEffect init i submit payload
- Trošak goriva (EUR) dodan kao novo polje u sekciji Vozilo servisera

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/components/dashboard/WorkOrderDetailModal.jsx

@@ -116,6 +116,11 @@ export default function WorkOrderDetailModal({ open, workOrder, onClose, onSubmi
             travel_end_at: workOrder.travel_end_at ? String(workOrder.travel_end_at).slice(0, 16) : '',
             purpose: workOrder.purpose || '',
             notes: workOrder.notes || '',
+            servicer_vehicle_registration: workOrder.servicer_vehicle_registration || '',
+            servicer_vehicle_make_model: workOrder.servicer_vehicle_make_model || '',
+            servicer_vehicle_start_mileage: workOrder.servicer_vehicle_start_mileage == null ? '' : String(workOrder.servicer_vehicle_start_mileage),
+            servicer_vehicle_end_mileage: workOrder.servicer_vehicle_end_mileage == null ? '' : String(workOrder.servicer_vehicle_end_mileage),
+            servicer_vehicle_fuel_cost: workOrder.servicer_vehicle_fuel_cost == null ? '' : String(workOrder.servicer_vehicle_fuel_cost),
             crane_current_mileage: String(workOrder.craneInfo?.current_mileage ?? ''),
             crane_superstructure_working_hours: String(workOrder.craneInfo?.superstructure_working_hours ?? ''),
             crane_chassis_working_hours: String(workOrder.craneInfo?.chassis_working_hours ?? ''),
@@ -416,6 +421,11 @@ export default function WorkOrderDetailModal({ open, workOrder, onClose, onSubmi
                 status: form.status,
                 start_mileage: startMileage,
                 end_mileage: endMileage,
+                servicer_vehicle_registration: form.servicer_vehicle_registration.trim(),
+                servicer_vehicle_make_model: form.servicer_vehicle_make_model.trim(),
+                servicer_vehicle_start_mileage: form.servicer_vehicle_start_mileage === '' ? null : Number(form.servicer_vehicle_start_mileage),
+                servicer_vehicle_end_mileage: form.servicer_vehicle_end_mileage === '' ? null : Number(form.servicer_vehicle_end_mileage),
+                servicer_vehicle_fuel_cost: form.servicer_vehicle_fuel_cost === '' ? null : Number(form.servicer_vehicle_fuel_cost),
                 location: form.location.trim(),
                 travel_start_at: travelStart ? travelStart.toISOString() : null,
                 travel_end_at: travelEnd ? travelEnd.toISOString() : null,
@@ -610,42 +620,55 @@ export default function WorkOrderDetailModal({ open, workOrder, onClose, onSubmi
                         <h4 className="mb-2 text-sm font-semibold text-text-main">Vozilo servisera</h4>
                         <div className="grid gap-4 sm:grid-cols-2">
                            <label className="flex flex-col gap-1 text-sm">
-                               <span className="font-medium text-text-main">Registracija</span>
+                               <span className="font-medium text-text-main">Registracija vozila servisera</span>
                                <input
                                    type="text"
-                                   value={workOrder?.craneInfo?.registration_number || ''}
+                                   value={form.servicer_vehicle_registration}
-                                   className="rounded-lg border border-border-hairline bg-canvas-deep px-3 py-2 text-text-muted"
+                                   onInput={(event) => setForm({ ...form, servicer_vehicle_registration: event.currentTarget.value })}
-                                   disabled
-                               />
-                           </label>
-                           <label className="flex flex-col gap-1 text-sm">
-                               <span className="font-medium text-text-main">Marka/Model</span>
-                               <input
-                                   type="text"
-                                   value={workOrder?.craneInfo?.display_name || ''}
-                                   className="rounded-lg border border-border-hairline bg-canvas-deep px-3 py-2 text-text-muted"
-                                   disabled
-                               />
-                           </label>
-                           <label className="flex flex-col gap-1 text-sm">
-                               <span className="font-medium text-text-main">Početna kilometraža {form.has_travel_order ? '*' : ''}</span>
-                               <input
-                                   type="number"
-                                   min="0"
-                                   value={form.start_mileage}
-                                   onInput={(event) => setForm({ ...form, start_mileage: event.currentTarget.value })}
                                    className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
                                    disabled={!isEditing}
                                />
                            </label>
-
                            <label className="flex flex-col gap-1 text-sm">
-                               <span className="font-medium text-text-main">Završna kilometraža</span>
+                               <span className="font-medium text-text-main">Marka/Model vozila servisera</span>
+                               <input
+                                   type="text"
+                                   value={form.servicer_vehicle_make_model}
+                                   onInput={(event) => setForm({ ...form, servicer_vehicle_make_model: event.currentTarget.value })}
+                                   className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
+                                   disabled={!isEditing}
+                               />
+                           </label>
+                           <label className="flex flex-col gap-1 text-sm">
+                               <span className="font-medium text-text-main">Početna km vozila servisera</span>
                                <input
                                    type="number"
                                    min="0"
-                                   value={form.end_mileage}
+                                   value={form.servicer_vehicle_start_mileage}
-                                   onInput={(event) => setForm({ ...form, end_mileage: event.currentTarget.value })}
+                                   onInput={(event) => setForm({ ...form, servicer_vehicle_start_mileage: event.currentTarget.value })}
+                                   className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
+                                   disabled={!isEditing}
+                               />
+                           </label>
+                           <label className="flex flex-col gap-1 text-sm">
+                               <span className="font-medium text-text-main">Završna km vozila servisera</span>
+                               <input
+                                   type="number"
+                                   min="0"
+                                   value={form.servicer_vehicle_end_mileage}
+                                   onInput={(event) => setForm({ ...form, servicer_vehicle_end_mileage: event.currentTarget.value })}
+                                   className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
+                                   disabled={!isEditing}
+                               />
+                           </label>
+                           <label className="flex flex-col gap-1 text-sm">
+                               <span className="font-medium text-text-main">Trošak goriva (EUR)</span>
+                               <input
+                                   type="number"
+                                   min="0"
+                                   step="0.01"
+                                   value={form.servicer_vehicle_fuel_cost}
+                                   onInput={(event) => setForm({ ...form, servicer_vehicle_fuel_cost: event.currentTarget.value })}
                                    className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
                                    disabled={!isEditing}
                                />
@@ -656,6 +679,28 @@ export default function WorkOrderDetailModal({ open, workOrder, onClose, onSubmi
                     <div className="rounded-xl border border-border-hairline bg-canvas-base p-3">
                         <h4 className="mb-2 text-sm font-semibold text-text-main">Podaci dizalice</h4>
                         <div className="grid gap-4 sm:grid-cols-2">
+                            <label className="flex flex-col gap-1 text-sm">
+                                <span className="font-medium text-text-main">Početna km dizalice (nalog)</span>
+                                <input
+                                    type="number"
+                                    min="0"
+                                    value={form.start_mileage}
+                                    onInput={(event) => setForm({ ...form, start_mileage: event.currentTarget.value })}
+                                    className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
+                                    disabled={!isEditing}
+                                />
+                            </label>
+                            <label className="flex flex-col gap-1 text-sm">
+                                <span className="font-medium text-text-main">Završna km dizalice (nalog)</span>
+                                <input
+                                    type="number"
+                                    min="0"
+                                    value={form.end_mileage}
+                                    onInput={(event) => setForm({ ...form, end_mileage: event.currentTarget.value })}
+                                    className="rounded-lg border border-border-hairline bg-canvas-base px-3 py-2 text-text-main disabled:bg-canvas-deep"
+                                    disabled={!isEditing}
+                                />
+                            </label>
                             <label className="flex flex-col gap-1 text-sm">
                                 <span className="font-medium text-text-main">Trenutna km dizalice</span>
                                 <input