Add Vim undo to the TUI composer - #41941
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## Why Composer drafts include attachments, mention targets, and deferred paste payloads in addition to visible text. Vim undo needs to restore that complete state as a single edit. ## What changed - Add bounded, draft-level Vim undo history, with `u` as the configurable default binding in normal mode. - Group complete Vim commands and insert sessions into undo steps, including direct composer changes such as pastes and attachments. - Preserve undo, repeat, and search state when a reverse-history preview is canceled, and start fresh history when another prompt is accepted. ## Testing - Cover grouped edits, custom bindings, history and search interactions, attachments, and large paste payloads. GitOrigin-RevId: 12ecdb3c34a2d66f5d856aa2f82dc15bd91b230b
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Add Vim undo to the TUI composer
Why
Composer drafts include attachments, mention targets, and deferred paste payloads in addition to visible text. Vim undo needs to restore that complete state as a single edit.
What changed
uas the configurable default binding in normal mode.Testing