P77（日历卡/浮动提示药丸化 + 面板与 hotbar 错开）证据分析 — 真实 Desktop xvfb 1280x720
近黑阈值 24；实心块 = 24x24 全近黑。

p43-hud-day: calendar=(1128, 47, 140, 48) dark_frac=0.094 maxblk=184 bright=256
p43-hud-night: calendar=(1128, 47, 140, 48) dark_frac=0.097 maxblk=176 bright=248

panelRect(1280,720,5)=(16, 536, 380, 116) bottom=652 vs hotbar_top=660
p67-target panel region=(16, 536, 380, 116) dark_frac=0.005 maxblk=70 bright=387

p44-dialog-a rect=(190, 510, 900, 138) bottom=648 vs hotbar_top=660
p44-dialog-c prompt band (0,480,1280,240) dark_frac=0.016 maxblk=176 bright=3343

diff p43-hud-day vs p43-hud-night: differing_pixels=921600
diff p44-dialog-a vs p44-dialog-c: differing_pixels=129318

verdict=PASS
  calendar/panel/prompt regions have no solid near-black block;
  panel and dialog bottoms clear the hotbar top; frames differ pairwise.