Option to render the plan box title at the bottom

Feature request: option to render the plan box title at the bottom

What I'd like: a way to display the plan box title (plan: <file>.md) at the bottom of the box instead of the top.

Currently, when a plan is approved, the box renders like this — title at the top:

Current plan · Approved
   ┌ plan: catwoman-patriot-forge.md ──────
   │ ...plan content...
   └───────────────────────────────────────

I'd prefer the filename title on the bottom border:

Current plan · Approved
   ┌───────────────────────────────────────
   │ ...plan content...
   └── plan: catwoman-patriot-forge.md ────

Where this is implemented: the plan box has a dedicated renderer in
apps/kimi-code/src/tui/components/messages/plan-box.ts
(PlanBoxComponent.render()). The title is drawn on the top border only:

const title = this.buildTitle(horzLen);
const trailingDashLen = Math.max(0, horzLen - visibleWidth(title));
const top = indent + paint('┌') + paint(title) + paint('─'.repeat(trailingDashLen)) + paint('┐');
const bottom = indent + paint('└' + '─'.repeat(horzLen) + '┘');

The bottom line is currently plain dashes, so moving the title there is a small, localized change affecting only the plan box (not other TUI boxes).

Suggestion: expose a config/theme option (e.g. title_position = "top" | "bottom"), or simply default the plan box title to the bottom. Happy to open a PR if a maintainer indicates a preferred approach.

Environment: kimi-code v0.38.0 (single-binary install), Linux.

Start in apps/kimi-code/src/tui/components/messages/plan-box.ts at PlanBoxComponent.render() and inspect how configuration or theme options are defined elsewhere in the TUI. Confirm the intended title-position behavior with the maintainer, then verify that the plan box renders the title correctly in each supported position without changing other TUI boxes.