* Show profile message actions for non-DM user profiles
* Add DM profile visibility safeguards and coverage
* Simplify DM channel name parsing and add reversed order test
Remove redundant manual split('__') validation in
isDirectMessageWithViewedUser, relying on getUserIdFromChannelName
which already handles both name orderings. Add test for reversed
DM channel name order (B__A) to prevent regressions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
