Fix: amount input flex width

src/components/AmountInput.vue

@@ -2,7 +2,7 @@
 controls * * Extracted from GiftedDialog.vue to handle numeric amount input *
 with increment/decrement buttons and validation. * * @author Matthew Raymer */
 <template>
-  <div class="flex">
+  <div class="flex flex-grow">
     <button
       class="rounded-s border border-e-0 border-slate-400 bg-slate-200 px-4 py-2"
       :disabled="isAtMinimum"