[Feature] Add support for showing current poll comment on alert

[sheep-q]

🔗 Issue Links

N/A

🎯 Goal

Display the current poll comment in the alert (if available), and configure the background color for PollCommentsView.

📝 Summary

• Display the current poll comment in the alert.
• Configure the background color for PollCommentsView.

🛠 Implementation

• Update newCommentText if the current user added a comment previously.
• Configure ColorPalette.background as the PollCommentsView background color.

🎨 Showcase

Add relevant screenshots and/or videos/gifs to easily see what this PR changes, if applicable.

Before	After

🧪 Manual Testing Notes

Explain how this change can be tested manually, if applicable.

☑️ 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

[laevandus]

Hi @sheep-q, I was running CI checks separately here. Could you please update snapshot test for PollAttachmentView_Tests.test_pollAttachmentView_allComments (delete existing snapshot file, run the test with iPhone 16 Pro).
Path to delete before re-running: StreamChatSwiftUITests/Tests/ChatChannel/__Snapshots__/PollAttachmentView_Tests/test_pollAttachmentView_allComments.default-dark.png
Since background colour changed, it is slightly different now.

[sheep-q]

Could you please update snapshot test for PollAttachmentView_Tests.test_pollAttachmentView_allComments

Hi @laevandus, I've updated the snapshot for it, pls check it out. Thank you.