feat: long message ctx menu

[isekovanic]

🎯 Goal

This PR implements the new design for very long messages in the context menu.

Short summary:

• Scrollability is removed
• Layout is changed to always visible top/bottom items
• Layout calculations have been adjusted to fit the frame here

🛠 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	380 KB	380 KB	0 B	🟢