umputun / revdiff / 24262664779

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feat(ui): add horizontal scroll overflow indicators (#89)

* feat(ui): add horizontal scroll overflow indicators

Show `«` and `»` markers at the edges of truncated diff lines in
unwrapped mode so users can tell when content extends off-screen.
The right indicator is placed flush against the pane border with a
leading space separator, extending 1 col beyond the normal cut width
into the pane's right padding column. Indicators blend with the
line's background (add/remove/modify/context) and use muted fg for
visibility; no-colors mode falls back to reverse video.

* fix(ui): address copilot review findings on scroll indicators

- correct narrow-viewport fallback threshold in godoc: cutWidth ≤ 2
  for dual overflow (was incorrectly ≤ 3)
- scrollIndicatorANSI now only emits fg/bg reset sequences when it
  actually set them, preserving inherited pane colors when lineBg
  is empty or Muted is unset
- reword "always truncates" godoc to clarify the cutWidth ≤ 0 early
  return case
- add regression test for the empty-lineBg no-reset behavior

86 of 89 new or added lines in 2 files covered. (96.63%)

5681 of 6445 relevant lines covered (88.15%)

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