refactor: remove ScreenComponent any cast from Ramp Deposit routes (MetaMask#28114)

## **Description**

Migrate the local `MainRoutes` component in Ramp Deposit routes from
prop-based route access to `useRoute()` hook, eliminating the `type
ScreenComponent = React.ComponentType<any>` escape hatch.

Part of the React Navigation v6 migration effort to remove
`no-explicit-any` violations from route files.

**Changes:**
- **`routes/index.tsx`**: Switch `MainRoutes` to `useRoute()`, remove
`MainRoutesProps`, `ScreenComponent` alias, and cast

## **Changelog**

CHANGELOG entry: null

## **Related issues**

Fixes:

## **Manual testing steps**

N/A — pure refactoring with no user-facing behavior change.

## **Screenshots/Recordings**

### **Before**

N/A

### **After**

N/A

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [x] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

Made with [Cursor](https://cursor.com)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk refactor limited to navigation param plumbing; behavior
should remain unchanged aside from potential typing/runtime differences
if the route context is misconfigured.
> 
> **Overview**
> Refactors `app/components/UI/Ramp/Deposit/routes/index.tsx` so
`MainRoutes` no longer accepts a `route` prop and instead pulls
`DepositNavigationParams` from React Navigation via `useRoute()`.
> 
> This removes the local `MainRoutesProps` typing and updates imports
accordingly, aiming to simplify typing and reduce `any`-style escape
hatches during the React Navigation v6 migration.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
b1db237. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: asalsys

app/components/UI/Ramp/Deposit/routes/index.tsx

@@ -3,7 +3,7 @@ import {
   createStackNavigator,
   StackNavigationOptions,
 } from '@react-navigation/stack';
-import { RouteProp } from '@react-navigation/native';
+import { RouteProp, useRoute } from '@react-navigation/native';
 import { BuyQuote } from '@consensys/native-ramps-sdk';
 import { DepositSDKProvider } from '../sdk';
 import { DepositNavigationParams } from '../types';
@@ -72,11 +72,9 @@ const getAnimationOptions = ({
   return { animationEnabled };
 };
 
-interface MainRoutesProps {
-  route: RouteProp<{ params: DepositNavigationParams }, 'params'>;
-}
-
-const MainRoutes = ({ route }: MainRoutesProps) => {
+const MainRoutes = () => {
+  const route =
+    useRoute<RouteProp<{ params: DepositNavigationParams }, 'params'>>();
   const parentParams = route.params;
 
   return (