fix(web): use message-square icon for settled icon-less project threads in sidebar v2 - #4279

Bugbot Analysis Progress (2m 47s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (2m 40s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_f2d956f1-b052-4989-b81a-32745d3bb9ac