- Buffer partial escape sequences in stdin handler so split SGR mouse
events don't leak garbage characters into PTY panes
- Widen pane button hit areas from 1 char to 2-4 chars each; add title
row click-to-expand; widen tab close/add buttons and pane list targets
- Fix [object Object] rendering in picker tab bar and pane list caused
by OpenTUI's t`` tag not handling StyledText interpolation; add st()
helper that concatenates StyledText by merging chunk arrays
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
