- the modal's hex views carried a 16-byte ASCII column per row; file data is
rarely text and the column halved the room for the two before/after views,
so it is gone: `hexImageRows` no longer builds an `ascii` field,
`hexImageHtml` no longer emits it and the `.hex-ascii` CSS rule is removed
- tests: the hex-row test asserts the field is gone (so it cannot come back
silently); README/README_RUS wording updated
- SW cache simtrace-analyser-v67 (cosmetic, no version bump)