fix: support pasting numbers with comma decimal separator in budget and bookings

Handle European number formats (e.g. 1.150,32) by detecting the last
separator as decimal and stripping thousand separators. Applied to
budget inline edit cells, add item row, and reservation price field.

Fixes #498

client/src/components/Planner/ReservationModal.tsx

@@ -678,7 +678,8 @@ export function ReservationModal({ isOpen, onClose, onSave, reservation, days, p
               <div style={{ flex: 1, minWidth: 0 }}>
                 <label style={labelStyle}>{t('reservations.price')}</label>
                 <input type="text" inputMode="decimal" value={form.price}
-                  onChange={e => { const v = e.target.value; if (v === '' || /^\d*\.?\d{0,2}$/.test(v)) set('price', v) }}
+                  onChange={e => { const v = e.target.value; if (v === '' || /^\d*[.,]?\d{0,2}$/.test(v)) set('price', v.replace(',', '.')) }}
+                  onPaste={e => { e.preventDefault(); let t = e.clipboardData.getData('text').trim().replace(/[^\d.,-]/g, ''); const lc = t.lastIndexOf(','), ld = t.lastIndexOf('.'), dp = Math.max(lc, ld); if (dp > -1) { t = t.substring(0, dp).replace(/[.,]/g, '') + '.' + t.substring(dp + 1) } else { t = t.replace(/[.,]/g, '') } set('price', t) }}
                   placeholder="0.00"
                   style={inputStyle} />
               </div>