feat(user-feedback): Add screenshots for Mobile platforms (#15083)

## DESCRIBE YOUR PR
Add missing screenshots for mobile platforms

Closes MOBILE-1044

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Add platform-specific User Feedback widget screenshots to Android,
Flutter, and React Native docs.
> 
> - **Docs: Mobile User Feedback**
> - **Android**: Add `./img/user-feedback-android-widget.png` screenshot
to `docs/platforms/android/user-feedback/index.mdx`.
> - **Flutter**: Add side-by-side iOS/Android screenshots in
`docs/platforms/dart/guides/flutter/user-feedback/index.mdx`.
> - **React Native**: Add side-by-side iOS/Android screenshots in
`docs/platforms/react-native/user-feedback/index.mdx`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
4b228a7. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: bruno <[email protected]>
Co-authored-by: Bruno Garcia <[email protected]>
Co-authored-by: getsantry[bot] <66042841+getsantry[bot]@users.noreply.github.com>

Author: 4 people

docs/platforms/android/user-feedback/img/user-feedback-android-widget.png

@@ -12,6 +12,8 @@ If you're using a self-hosted Sentry instance, you'll need to be on version 24.4
 Ensure you are using the Android SDK version 8.14.0 or above of the SDK to access the latest features.
 </Alert>
 
+![An example of the User Feedback Widget on Android =350x](./img/user-feedback-android-widget.png)
+
 ## Widget
 
 The widget is a custom button that opens the feedback form. You can use it directly in your layout XML or instantiate it programmatically:

docs/platforms/android/user-feedback/index.mdx

@@ -27,7 +27,9 @@ Users can also take a screenshot of their app's UI. Additionally, you can provid
 
 The image below provides an example of the widget, though yours may differ depending on your customization:
 
-![SentryFeedbackWidget](./img/flutter_sentry_feedback_widget.png)
+|User Feedback iOS              |User Feedback Android                     |
+|:-----------------------------:|:---------------------------------------: |
+|![User Feedback Widget on Flutter iOS =500x](./img/user-feedback-flutter-ios-widget.png)  |![User Feedback Widget on Flutter Android =500x](./img/user-feedback-flutter-android-widget.png) |
 
 ### Integration
 

docs/platforms/dart/guides/flutter/user-feedback/img/flutter_sentry_feedback_widget.png

@@ -9,6 +9,10 @@ The User Feedback feature allows you to collect user feedback from anywhere insi
 
 Note that if you're using a self-hosted Sentry instance, you'll need to be on version 24.4.2 or higher in order to use the full functionality of the User Feedback feature. Lower versions may have limited functionality.
 
+|User Feedback iOS              |User Feedback Android                     |
+|:-----------------------------:|:---------------------------------------: |
+|![User Feedback Widget on React Native iOS =500x](./img/user-feedback-rn-ios-widget.png)  |![User Feedback Widget on React Native Android =500x](./img/user-feedback-rn-android-widget.png) |
+
 ## User Feedback Widget
 
 The user feedback widget allows users to submit feedback from anywhere inside your application.