ux: accent glow on quick-add input after successful item add

public/pages/shopping.js

@@ -352,6 +352,8 @@ function wireQuickAdd(container) {
       // Erfolgs-Feedback auf dem +-Button (DOM-API, kein innerHTML)
       _flashAddBtn(form.querySelector('.quick-add__btn'));
       nameInput.focus();
+      nameInput.classList.add('quick-add__input--flash');
+      nameInput.addEventListener('animationend', () => nameInput.classList.remove('quick-add__input--flash'), { once: true });
     } catch (err) {
       window.oikos.showToast(err.message, 'danger');
     }

public/styles/layout.css

@@ -2336,6 +2336,23 @@ textarea.input { resize: vertical; }
   }
 }
 
+/* --------------------------------------------------------
+ * Signature Moment: Eingabefeld-Glow nach erfolgreichem Item-Add
+ * -------------------------------------------------------- */
+@keyframes input-add-flash {
+  0%   { box-shadow: none; }
+  25%  { box-shadow: 0 0 0 3px color-mix(in srgb, var(--module-accent, var(--color-accent)) 45%, transparent); }
+  100% { box-shadow: none; }
+}
+
+.quick-add__input--flash {
+  animation: input-add-flash 550ms var(--ease-out) forwards;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .quick-add__input--flash { animation: none; }
+}
+
 /* --------------------------------------------------------
  * Windows High Contrast / Forced Colors
  * -------------------------------------------------------- */