fix: correct bottom row text variant and remove getItemLayout in Bridge token selector

- TokenSelectorItem: fix BOTTOM_ROW_BALANCE_TEXT_STYLE to use BodySM
  (was accidentally changed to BodyMD when extracting the inline constant),
  restoring visual alignment with the BodySM token name on the same row
- BridgeTokenSelector: remove getItemLayout since items have variable
  heights due to conditional badges and labels — fixed offsets cause
  scroll position jumps with non-uniform items

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: javiergarciavera

app/components/UI/Bridge/components/BridgeTokenSelector/BridgeTokenSelector.tsx

@@ -550,11 +550,6 @@ export const BridgeTokenSelector: React.FC = () => {
         maxToRenderPerBatch={5}
         windowSize={5}
         removeClippedSubviews
-        getItemLayout={(_data, index) => ({
-          length: ESTIMATED_ITEM_HEIGHT,
-          offset: ESTIMATED_ITEM_HEIGHT * index,
-          index,
-        })}
       />
     </SafeAreaView>
   );

app/components/UI/Bridge/components/TokenSelectorItem.tsx

@@ -274,7 +274,7 @@ const TOP_ROW_BALANCE_TEXT_STYLE = {
 } as const;
 
 const BOTTOM_ROW_BALANCE_TEXT_STYLE = {
-  textVariant: TextVariant.BodyMD,
+  textVariant: TextVariant.BodySM,
   textColor: TextColor.Alternative,
 } as const;