Fix reaction author's view with shrinked reaction images in iOS 18

[nuno-vieira]

🔗 Issue Links

Resolves https://linear.app/stream/issue/IOS-652/[uikit]-reaction-icons-have-invalid-size-in-reactions-overlay

🎯 Goal

Fixes reaction author's view with shrinked reaction images introduced on iOS 18.

We did not spot the bug when re-recording iOS 18 snapshots here: #3509

🛠 Implementation

The root of the issue is that on iOS 18, the Button.image.size is nil in the ChatMessageReactionItemView.intrinsicContentSize when it is inside the reaction author cell view. The best way I found to fix the issue without breaking changes is to provide a default size instead of super.intrinsicContentSize in case the image does not have any size.

🧪 Manual Testing Notes

It is not necessary to do manual tests since it is covered by snapshots.

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• Changelog is updated with new localization keys
• New code is covered by unit tests
• Documentation has been updated in the docs-content repo

[Stream-SDK-Bot]

SDK Performance

target	metric	benchmark	branch	performance	status
MessageList	Hitches total duration	10 ms	3.34 ms	66.6% 🔼	🟢
	Duration	2.6 s	2.55 s	1.92% 🔼	🟢
	Hitch time ratio	4 ms per s	1.31 ms per s	67.25% 🔼	🟢
	Frame rate	75 fps	77.93 fps	3.91% 🔼	🟢
	Number of hitches	1	0.4	60.0% 🔼	🟢

[testableapple]

LGTM 👍

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChat	7.02 MB	7.02 MB	0 KB	🟢
StreamChatUI	4.77 MB	4.77 MB	0 KB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
176 New issues
0 Accepted issues

Measures
0 Security Hotspots
84.1% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarQube Cloud