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Review P2 (#6731): in the narrow single-panel layout, opening a document unmounted the focused attachment card and closing unmounted the focused panel, dropping keyboard/screen-reader users onto <body> (then the remounted channel's composer autofocus). The panel now moves focus to its close control on mount and returns it to the opening card on unmount, matched by data-doc-url since the original element was remounted meanwhile; the restore yields to any control that already claimed focus, overriding only <body> and the composer autofocus. A narrow-layout e2e covers open-focus and Escape-restore. Also moves the Preview/Code picker out of the title row onto its own pinned row below the header (review feedback: the shared row squeezed the filename out), inside the chrome-padded body since the header band overlays anything placed after it in the header slot. Signed-off-by: Riley Crane <rileycrane@squareup.com> Co-authored-by: Fizz <d4ec90109b43092b0ec94cf136850915a3732a29ab3089a1dec43d2ed43dd6eb@buzz.block.builderlab.xyz> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>