[AND-448] Fix MessageItem not respecting messageItemMaxWidth.

[VelikovPetar]

🎯 Goal

The ChatTheme.dimens.messageItemMaxWidth wasn't being respected for values larger than 300dp due to a fixed widthIn(max = 300.dp) modifier on the parent component. With this PR, the limit is removed, and we ensure that the ChatTheme.dimens.messageItemMaxWidth is respected (if it would fit in the screen)

🛠 Implementation details

• Remove fixed widthIn(max = 300.dp) modifier
• Ensure the message bubble takes up as much possible space as needed, but not more than the instructed value

🎨 UI Changes

messageItemMaxWidth	Before	After
250dp (default)
300dp
400dp
500dp

🧪 Testing

1. Set ChatTheme.dimens.messageItemMaxWidth to a specific value
2. Run Compose sample
3. The message bubble show respect the new maxWidth (if possible)

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	3.16 MB	3.16 MB	0.00 MB	🟢
stream-chat-android-offline	3.38 MB	3.38 MB	0.00 MB	🟢
stream-chat-android-ui-components	7.89 MB	7.89 MB	0.00 MB	🟢
stream-chat-android-compose	9.94 MB	9.94 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
81.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud