[v4] Fix typing events sent on channels without typing capability

[nuno-vieira]

🔗 Issue Links

IOS-1798

Cherry-pick of #4132 and #4146 to v4.

🎯 Goal

Backport typing event fixes to v4. These prevent typing.stop and typing.start API requests from being sent on channels where typing events are disabled (e.g. livestream), which causes the server to reject them with 400 errors.

📝 Summary

• Default shouldSendTypingEvents to false when channel is not loaded (was true)
• Guard sendKeystrokeEvent, sendStartTypingEvent, sendStopTypingEvent behind shouldSendTypingEvents / canSendTypingEvents capability check
• Guard the stopTyping call in ChannelController.createNewMessage behind shouldSendTypingEvents
• Same guards added to the Chat state layer

🛠 Implementation

Cherry-picked from develop PRs #4132 and #4146 with minor conflict resolution for v4 API differences (non-Sendable closures).

🧪 Manual Testing Notes

1. Create a livestream channel type with typing events disabled
2. Send a message / type in that channel
3. Verify no typing.start or typing.stop 400 errors in the network logs

☑️ 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

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/typing-events-v4

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[Stream-SDK-Bot]

SDK Performance

target	metric	benchmark	branch	performance	status
MessageList	Hitches total duration	10 ms	6.68 ms	33.2% 🔼	🟢
	Duration	2.6 s	2.55 s	1.92% 🔼	🟢
	Hitch time ratio	4 ms per s	2.62 ms per s	34.5% 🔼	🟢
	Frame rate	75 fps	78.94 fps	5.25% 🔼	🟢
	Number of hitches	1	0.8	20.0% 🔼	🟢

[Stream-SDK-Bot]

SDK Size

title	v4	branch	diff	status
StreamChat	8.69 MB	8.69 MB	0 KB	🟢
StreamChatUI	4.94 MB	4.94 MB	0 KB	🟢

[github-actions]

Public Interface

🚀 No changes affecting the public interface.

[Stream-SDK-Bot]

StreamChat XCSize

Object	Diff (bytes)
Chat.o	+2292
ChannelController.o	+1748
LivestreamChannelController.o	-56

[sonarqubecloud]

Quality Gate passed

Issues
127 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud