chore(runway): cherry-pick fix: perp and short transition cp-7.73.0 (#28700)

- fix: perp and short transition cp-7.73.0 (#28689)

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## **Description**
Fix perps and short transition
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also include relevant motivation and context. Have in mind the following
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## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

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### **Before**

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### **After**



https://github.com/user-attachments/assets/c922da17-10ce-4ed4-b1c0-7690cbe8471b


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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Touches React Navigation screen options for the perps confirmation
flow, which can affect modal presentation/transition behavior and header
visibility across routes.
> 
> **Overview**
> Adjusts the perps `RedesignedConfirmations` screen options to
explicitly return `StackNavigationOptions` and always use `presentation:
'transparentModal'`, while keeping the conditional perps header
behavior.
> 
> This is intended to fix the perps/short transition behavior by
ensuring confirmations are presented with a consistent transparent modal
configuration.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ccdf1f4. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
[5517bff](5517bff)

Co-authored-by: tommasini <46944231+tommasini@users.noreply.github.com>

Author: runway-github[bot]

app/components/UI/Perps/routes/index.tsx

@@ -1,4 +1,7 @@
-import { createStackNavigator } from '@react-navigation/stack';
+import {
+  createStackNavigator,
+  type StackNavigationOptions,
+} from '@react-navigation/stack';
 import React from 'react';
 import { useSelector } from 'react-redux';
 import type { PerpsNavigationParamList } from '../types/navigation';
@@ -52,14 +55,15 @@ const styles = StyleSheet.create({
 
 function getRedesignedConfirmationsHeaderOptions({
   showPerpsHeader = CONFIRMATION_HEADER_CONFIG.DefaultShowPerpsHeader,
-}: PerpsNavigationParamList['RedesignedConfirmations'] = {}) {
+}: PerpsNavigationParamList['RedesignedConfirmations'] = {}): StackNavigationOptions {
   return showPerpsHeader
-    ? {
+    ? ({
         headerLeft: () => null,
         headerShown: true,
         title: '',
-      }
-    : { header: () => null };
+        presentation: 'transparentModal',
+      } as const)
+    : ({ header: () => null, presentation: 'transparentModal' } as const);
 }
 
 const PerpsConfirmScreen = () => {