This PR makes the `/statusline` and `/title` setup UIs share one
preview-value source instead of each surface using its own examples.
Both pickers now render consistent live values when available, and
stable placeholders when they are not. It also resolves live preview
values at the shared preview-item layer, so `/title` preview can use
real runtime values for title-specific cases like status text, task
progress, and project-name fallback behavior.
- Adds a shared preview data model for status surfaces
- Maps status-line items and terminal-title items onto that shared
preview list
- Feeds both setup views from the same chatwidget-derived preview data,
with terminal-title-specific formatting applied before `/title` preview
renders
- Keeps project-root preview aligned with status-line behavior while
project in /title keeps its title fallback/truncation behavior
- Adds snapshot coverage for live-only, hardcoded-only, and mixed cases
Test Steps
- Open Codex TUI and launch `/statusline`.
- Toggle and reorder items, then verify the preview uses current session
values when possible, and placeholder values for missing values (ex: no
thread ID).
- Open `/title` and verify it shows the same normalized values,
including live status/task-progress values when available.
## Summary
- Track how many realtime transcript entries have already been attached
to a background-agent handoff.
- Attach only entries added since the previous handoff as
`<transcript_delta>` instead of resending the accumulated transcript
snapshot.
- Update the realtime integration test so the second delegation carries
only the second transcript delta.
## Validation
- `just fmt`
- `cargo test -p codex-api`
- `cargo test -p codex-core
inbound_handoff_request_sends_transcript_delta_after_each_handoff`
- `cargo build -p codex-cli -p codex-app-server`
## Manual testing
Built local debug binaries at:
- `codex-rs/target/debug/codex`
- `codex-rs/target/debug/codex-app-server`
Addresses #18505
## Summary
When Codex is launched from a subdirectory of a Git repository, the
onboarding trust prompt says it is trusting the current directory even
though the persisted trust target is the repository root. That can make
the scope of the trust decision unclear.
This updates the TUI trust prompt to show a yellow note only when the
current directory differs from the resolved trust target, explaining
that trust applies to the repository root and displaying that root. It
also removes the stale onboarding TODO now that the warning is
implemented.
rhan-oai