Add cross-platform text clipboard operations (macOS, Linux, Windows)
with OSC 52 support for SSH/tmux environments. Wire up onMouseUp and
Ctrl+Y in the TUI to copy selected text to the system clipboard via
OpenTUI's renderer selection API.
- Render permission modal inline below log panel instead of floating CenteredModal overlay
- Hide input area when permission prompt is active
- Add dev:debug and dev:debug-brk scripts for Bun inspector debugging
- Add background color to header to prevent content bleeding through
- Add margin spacing between header and log panel
- Change permission modal border to top-only for cleaner inline appearance