fix: respect topInset on bottom sheet once again

[isekovanic]

🎯 Goal

This PR addresses a regression with our AttachmentPicker component which was done in order to fix accessibility issues. Namely, since we calculate the topInset for our BottomSheet in order to make it properly orderable by screen readers, the value for the global topInset was omitted.

This is wrong, because then the calculations are very wrong particularly in the cases of having native modals (i.e react-navigation/native-stack or expo-router) whose height we need to take into account, similarly to how we do it for keyboardVerticalOffset.

🛠 Implementation details

🎨 UI Changes

iOS

Before	After

Android

Before	After

🧪 Testing

☑️ Checklist

• I have signed the Stream CLA (required)
• PR targets the develop branch
• Documentation is updated
• New code is tested in main example apps, including all possible scenarios
  • SampleApp iOS and Android
  • Expo iOS and Android

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
js_bundle_size	368 KB	368 KB	0 B	🟢