d1235a0a78
Addresses #22599 ## Why `/side` currently lets `Esc` return to the parent thread. Multiple users reported that this collides with queued-steer UI that also advertises `Esc`, so a timing-sensitive keypress can dismiss an ephemeral side chat instead of sending the queued prompt. After removing that dismissal shortcut, the same `Esc` path could fall through to main-thread backtrack/edit-previous handling, which is not valid for ephemeral side conversations. This keeps `/side` out of both global `Esc` behaviors. ## What changed - Remove `Esc` from the `/side` return shortcut matcher while keeping the existing `Ctrl+C` and `Ctrl+D` behavior. - Update side-conversation hints and blocked-command copy to advertise `Ctrl+C` as the return shortcut. - Rename the reserved `Esc` keymap label to describe backtracking only. - Block backtrack/edit-previous handling while a side conversation is active and report `Editing previous prompts is unavailable in side conversations.` when that path would have fired. - Keep composer-owned `Esc` behavior, such as Vim insert-mode escape, routed locally. - Refresh focused shortcut assertions and TUI snapshots for the updated footer and new side-conversation error message. ## Verification Manually tested `/side` use cases and `Esc`, `Ctrl+C`, `Ctrl+D`.
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