plans: sidebar owner note for the update card's cancel and layout (#29653)
Merged
TE
7d ago+8-0
Docs only. #29653's fast gates flagged its commits for no Sidebar-Look: trailer and no entry in plans/cmux-next/sidebar-owner.md. This adds the entry, quoting Leo's words, and the trailer.
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Summary by cubic
Adds the missing owner-note entry and Sidebar-Look trailer for #29653 so its commits pass the fast gates.
- Records the update card's cancellable download, cancel button placement, and layout changes in
plans/cmux-next/sidebar-owner.md, quoting Leo's feedback verbatim.