Felipe Coury 31434401fa
Add keyboard selection support to the transcript view ( #53693 ) ...
## What changed
Add transcript select-mode state with an underlined cursor, grapheme-aware movement via arrow keys or `h`/`j`/`k`/`l`, and vertical movement that preserves the preferred display column. Support marking with `v`, Space, or Shift-arrow keys and copying through the existing selection machinery.
Keep the displayed transcript snapshot and reading position paused during selection and after exiting the mode. Add entry and exit methods; this change does not yet bind mode entry to a user-facing key.
## Testing
Add unit tests for initial cursor placement, movement across empty lines and entry boundaries, wrapped text, preferred-column preservation, and Enter behavior with and without a marked range.
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Felipe Coury
31434401fa