feat: drag & drop razeni polozek pri vytvareni faktury

Nahrazeny tlacitka nahoru/dolu za @dnd-kit drag & drop (SortableRow + DragHandle),
stejny pattern jako v nabidkach.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/admin/pages/InvoiceCreate.jsx

@@ -6,6 +6,11 @@ import Forbidden from '../components/Forbidden'
 import FormField from '../components/FormField'
 import AdminDatePicker from '../components/AdminDatePicker'
 import { motion } from 'framer-motion'
+import { DndContext, closestCenter, KeyboardSensor, PointerSensor, TouchSensor, useSensor, useSensors } from '@dnd-kit/core'
+import { SortableContext, verticalListSortingStrategy } from '@dnd-kit/sortable'
+import { restrictToVerticalAxis } from '@dnd-kit/modifiers'
+import SortableRow, { DragHandle } from '../components/SortableRow'
+import useSortableList from '../hooks/useSortableList'
 import apiFetch from '../utils/api'
 import { formatCurrency } from '../utils/formatters'
 
@@ -315,15 +320,12 @@ export default function InvoiceCreate() {
     setItems(prev => prev.filter((_, i) => i !== index))
   }
 
-  const moveItem = (index, direction) => {
+  const sensors = useSensors(
-    setItems(prev => {
+    useSensor(PointerSensor, { activationConstraint: { distance: 5 } }),
-      const newItems = [...prev]
+    useSensor(TouchSensor, { activationConstraint: { delay: 200, tolerance: 5 } }),
-      const target = index + direction
+    useSensor(KeyboardSensor)
-      if (target < 0 || target >= newItems.length) return prev
+  )
-      ;[newItems[index], newItems[target]] = [newItems[target], newItems[index]]
+  const { handleDragEnd } = useSortableList(setItems, '_key')
-      return newItems
-    })
-  }
 
   // Totals
   const totals = useMemo(() => {
@@ -651,24 +653,37 @@ export default function InvoiceCreate() {
           </div>
 
           <div className="offers-items-table">
+            <DndContext
+              sensors={sensors}
+              collisionDetection={closestCenter}
+              modifiers={[restrictToVerticalAxis]}
+              onDragEnd={handleDragEnd}
+            >
               <table className="admin-table">
                 <thead>
                   <tr>
-                  <th style={{ width: '2.5rem', textAlign: 'center' }}>#</th>
+                    <th style={{ width: '2rem' }}></th>
+                    <th style={{ width: '2rem', textAlign: 'center' }}>#</th>
                     <th>Popis</th>
                     <th style={{ width: '5.5rem', textAlign: 'center' }}>Množství</th>
                     <th style={{ width: '5.5rem', textAlign: 'center' }}>Jednotka</th>
                     <th style={{ width: '5.5rem', textAlign: 'center' }}>Jedn. cena</th>
                     {form.apply_vat ? <th style={{ width: '5rem', textAlign: 'center' }}>DPH</th> : null}
                     <th style={{ width: '8rem', textAlign: 'right' }}>Celkem</th>
-                  <th style={{ width: '5.5rem', textAlign: 'center' }}></th>
+                    <th style={{ width: '2.5rem' }}></th>
                   </tr>
                 </thead>
+                <SortableContext items={items.map(i => String(i._key))} strategy={verticalListSortingStrategy}>
                   <tbody>
                     {items.map((item, index) => {
                       const lineTotal = (Number(item.quantity) || 0) * (Number(item.unit_price) || 0)
                       return (
-                    <tr key={item._key || index}>
+                        <SortableRow key={item._key} id={String(item._key)}>
+                          {({ attributes, listeners }) => (
+                            <>
+                              <td style={{ width: '2rem' }}>
+                                <DragHandle listeners={listeners} attributes={attributes} />
+                              </td>
                               <td className="text-tertiary" style={{ textAlign: 'center', fontWeight: 500 }}>{index + 1}</td>
                               <td>
                                 <input
@@ -729,13 +744,6 @@ export default function InvoiceCreate() {
                                 {formatCurrency(lineTotal, form.currency)}
                               </td>
                               <td>
-                        <div style={{ display: 'flex', gap: '0.125rem', justifyContent: 'center' }}>
-                          <button type="button" onClick={() => moveItem(index, -1)} disabled={index === 0} className="admin-btn-icon" title="Nahoru" aria-label="Nahoru">
-                            <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="M18 15l-6-6-6 6" /></svg>
-                          </button>
-                          <button type="button" onClick={() => moveItem(index, 1)} disabled={index === items.length - 1} className="admin-btn-icon" title="Dolů" aria-label="Dolů">
-                            <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><path d="M6 9l6 6 6-6" /></svg>
-                          </button>
                                 {items.length > 1 && (
                                   <button type="button" onClick={() => removeItem(index)} className="admin-btn-icon danger" title="Odebrat" aria-label="Odebrat">
                                     <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
@@ -743,13 +751,16 @@ export default function InvoiceCreate() {
                                     </svg>
                                   </button>
                                 )}
-                        </div>
                               </td>
-                    </tr>
+                            </>
+                          )}
+                        </SortableRow>
                       )
                     })}
                   </tbody>
+                </SortableContext>
               </table>
+            </DndContext>
           </div>
 
           {/* Soucty */}