One button on a session row, and archive as the way out

Harden Reader request scheduling

Speed up Reader first paint

Review round 3: a spinning pane, a fix that was never wired, a reader that could not page

Reader mode pages back too — which is what was asked for

Reader: keep the reader's place, their open folds, and the disclosure

Review fixes: a window must not claim what it cannot know

Don't page on an unmeasured scroll position

Anchor the reading position on the row itself, not on the height model

Trace reader: open on the last exchange, page backwards by byte window

Files pane: previews for every file type, an editor that saves itself, traces, and create/delete (#15)

Session sharing: publish a session's trace as a Hub dataset, and read one in a panel (#10)