Fixes#21665.
## Why
The TUI status line is the right place for compact, glanceable session
state. The original request was motivated by the need to see the active
permission posture without opening `/permissions` or `/status`,
especially when switching between safer and more permissive modes during
a session.
This PR intentionally separates `permissions` from `approval-mode`
instead of combining them into one status-line item. They answer related
but different questions: `permissions` describes the active
sandbox/profile shape, while `approval-mode` describes how command
approvals are handled. Keeping them separate makes each item
independently configurable and avoids long combined labels in an already
space-constrained status line.
The tradeoff is that users who want the full permission posture in the
status line need to opt into both items. In exchange, users can show
only the sandbox/profile label, only the approval behavior, or both, and
named user-defined profiles remain concise. Non-standard permission
shapes are rendered as `Custom permissions` rather than trying to
squeeze detailed profile contents into the status line; `/status`
remains the fuller explanatory surface.
## What changed
- Added a configurable `permissions` status-line item.
- Added a separate `approval-mode` status-line item, with `approval` as
an alias.
- Render standard permission states compactly as `Read Only`,
`Workspace`, or `Full Access`.
- Preserve user-defined permission profile names directly in the status
line.
- Render unnamed non-standard permission shapes as `Custom permissions`.
- Refresh status surfaces when `/permissions` updates the permission
profile, approval policy, or approval reviewer.
- Updated status-line preview snapshot coverage for the new items.
## Verification
- `cargo test -p codex-tui
status_permissions_non_default_workspace_write_uses_workspace_label`
- `cargo test -p codex-tui
permissions_selection_emits_history_cell_when_selection_changes`
- `cargo insta pending-snapshots --manifest-path tui/Cargo.toml`
Eric Traut
e6312d44f0