## What changed
- Display the leading `/` in the prompt marker instead of the editable text, sharing prefix state with shell mode's `!`.
- Preserve command prefixes and text element offsets across submission, queuing, history, and external editing. Keep prefixes literal in plain-text composers.
- Track composer-owned slash command elements separately, omit them from exported draft elements, and refresh them when command availability changes.
- Let backward deletion at the start of the text remove the prompt prefix while preserving selected-text deletion and Vim Replace recovery.
## Testing
Add regression coverage for slash prompt cursor placement, prefix deletion, history search highlighting, dynamic command availability, and Vim Replace restoration, including Unicode text. Update rendering snapshots for the slash prompt marker.
GitOrigin-RevId: 0da42da8e98bf7885f9b0ba2c8d5ad4f44d6847e
## What changed
- Render transcript history and live output above the composer when `features.transcript_v2` is enabled and alternate-screen rendering is available. Handle scrolling, selection, copying, links, and older-history pagination in the main view.
- Add a clickable return-to-latest control with new-activity hints and temporary clipboard status. Let plain Enter return to latest when the composer is empty.
- Reflow retained transcript content during drawing and preserve the launch-selected screen mode across configuration reloads and session transitions, including `--no-alt-screen` restrictions.
- Enter the alternate screen with its first synchronized frame, and box CLI startup futures to reduce stack usage during session transitions.
## Testing
Add regression coverage for transcript layout, input routing, follow controls, clipboard status, and screen-mode persistence. Add a PTY test for the first alternate-screen frame and clean exit, and extend session-transition coverage through the CLI dispatcher.
GitOrigin-RevId: 1daf077826c7744b0f57399d10d159923dc87a97
## Why
Session transitions need stack headroom to rebuild configuration and the chat widget. Tokio stores task outputs inline even when it boxes the task future, so returning a large `Config` adds stack pressure during task allocation.
## What changed
Box the configuration build result inside the runtime worker and unbox it after joining. Box the `App::run` future to keep the large event loop out of enclosing startup futures.
## Testing
Extend the production-stack TUI integration test to enter `/side`, verify the process remains running, and return to the saved conversation with Ctrl+C.
GitOrigin-RevId: 44975300bb837bf3645ff762cf7bcdc44a277f41
## Why
Session transitions need stack headroom for embedded-server initialization and configuration loading. Running them inside event dispatch risks exhausting the TUI thread's stack.
## What changed
- Queue `/resume` and valid `/cd` requests for processing after event dispatch returns.
- Reject additional `/cd` requests while one is pending, and recheck the source session, working directory, idle state, and remote-environment restrictions before applying it.
## Testing
Add a Unix PTY regression test that exercises `/resume`, worktree conversation forks, `/cd`, and new worktree conversations through the real TUI event loop. Update the directory-change test to verify that dispatch queues the request without immediately changing configuration.
GitOrigin-RevId: 4950921931dfaba9e55e6bb04f98f7ba64b72122
Benjamin Carlsson