Preserve TUI drafts after app-server disconnects - #41911
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## Why Losing an external app-server connection can leave a submission's outcome uncertain. The TUI must preserve local work without retrying it or allowing stale server events to trigger more actions. ## What changed - Enter an offline state when an external app-server transport disconnects during startup, event streaming, or submission. - Keep conversation drafts, queued input, expanded pastes, attachments, and agent-overview input editable while blocking submissions, remote actions, and automatic queue replay. - Show a connection-lost notice that directs users to copy their work and relaunch, while retaining `Ctrl-C` and an empty-composer `Ctrl-D` as quit shortcuts. - Cancel pending views and asynchronous work, and ignore stale completions after the disconnect. Embedded app-server behavior is unchanged. ## Testing Added unit, snapshot, and pseudo-terminal coverage for lost startup and mutation replies, offline draft editing, queued-input recovery, stale-event quarantine, agent-overview behavior, and end-to-end preservation without reconnection or resubmission. GitOrigin-RevId: 7219a95fad676dda447d625db9e465345b469d58
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Preserve TUI drafts after app-server disconnects
Why
Losing an external app-server connection can leave a submission's outcome uncertain. The TUI must preserve local work without retrying it or allowing stale server events to trigger more actions.
What changed
Ctrl-Cand an empty-composerCtrl-Das quit shortcuts.Testing
Added unit, snapshot, and pseudo-terminal coverage for lost startup and mutation replies, offline draft editing, queued-input recovery, stale-event quarantine, agent-overview behavior, and end-to-end preservation without reconnection or resubmission.