feat(tui): add transcript text selection - #33
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Summary
Add mouse-driven transcript selection and copy support to the TUI, including highlighting and source-aware reconstruction across wrapped lines. Handle reflow, Unicode display cells, and mouse gestures without triggering stale row actions.
Impact
Users can drag-select rendered transcript text and copy it with Ctrl+Y. Existing Ctrl+Y behavior still copies the latest assistant response when no selection exists.
Technical details
Source-aware wrapping
Cache removed source whitespace per wrapped row so word-wrapped text is rejoined accurately while hard-wrapped URLs and tokens are not modified.
Stable interactions
Clear display-coordinate selections on transcript reflow, and cancel pending clicks when scrolling or dismissing and replacing a selection.
This change bumps Kit to 0.1.97.
Demo
Screen.Recording.2026-08-27.at.12.48.19.mov