fix: vertically center items in zap amount popup row

The bolt-icon pill chips and the Tune settings button have different
intrinsic heights, so FlowRow's default top alignment leaves the
settings button visually higher than the chips. Set itemVerticalAlignment
so every item is centered within the row.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/ReactionsRow.kt

@@ -1982,6 +1982,7 @@ fun ZapAmountChoicePopupContent(
                 modifier = Modifier.padding(horizontal = 5.dp, vertical = 5.dp),
                 horizontalArrangement = Arrangement.Center,
                 verticalArrangement = Arrangement.Center,
+                itemVerticalAlignment = CenterVertically,
             ) {
                 zapAmountChoices.forEach { amountInSats ->
                     ZapAmountChip(