Fixe affichage versement

frontend/src/pages/Remboursements.jsx

@@ -1588,7 +1588,7 @@ export default function Remboursements() {
                   )}
                   <label>Montant versé (€)</label>
                     <input type="number" step="0.01" value={netRecu} readOnly
-                      style={{ background: 'var(--bg-input-readonly, rgba(255,255,255,.05))', cursor: 'default' }} />
+                      style={{ background: 'var(--surface-2)', color: 'var(--text-muted)', cursor: 'not-allowed' }} />
                   </div>
                   <div style={{ gridColumn: 'span 3', display: 'flex', alignItems: 'center', gap: 8, fontSize: 13 }}>
                     <span style={{ color: 'var(--text-muted)' }}>