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- Mentions now insert a span carrying the user id (handles names with spaces): the sanitizer permits <span class="mention" data-user-card="ULID">, comment and chat notifications resolve by id and only fire for users with access, and mentions render as clickable chips with the shared hover user-card. - Messages composer inserts an atomic, non-editable mention chip so the trailing space no longer collapses while typing. - Links inside chat messages and task comments are underlined/accented so they read as clickable. - Atomization: hold Ctrl/Cmd while dragging an effort slider to rebalance the sibling coefficients proportionally (sum stays ~1.00); added a hint. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>