v0.4.15

[0.4.15] - 2026-05-15

• Restored visibility of the Left / Right vertical tab strip (broken in
  v0.4.13, still broken after the v0.4.14 partial revert). Rolled
  handle_vertical_tab_custom_draw back to the v0.4.12 painting model
  (CDRF_NEWFONT | CDRF_NOTIFYPOSTPAINT at CDDS_ITEMPREPAINT, close glyph
  in CDDS_ITEMPOSTPAINT) — letting comctl32 draw the row text again is
  what brings the rows back. The v0.4.13 attempt to fully self-paint and
  return CDRF_SKIPDEFAULT reliably produces a blank ListView on the
  LVS_REPORT + LVS_NOCOLUMNHEADER + LVS_EX_FULLROWSELECT configuration.
• Fixed the "all tabs appear highlighted" bug at the same time by replacing
  NMLVCUSTOMDRAW.nmcd.uItemState & CDIS_SELECTED (which is unreliable for
  ListView item state — CDIS_SELECTED = 1 collides with LVIS_FOCUSED = 1)
  with a direct doc_index == state.active test. The active doc index is
  the authoritative source of "which tab is selected" used everywhere else
  in the codebase, so only one row paints with selection_bg now.