f69d34508d
Add per-segment mouseover tooltip (stage, start–end clock, duration) to the sleep timeline, matching the other trend charts. Darken REM from #8b5cf6 to #7c3aed across the hypnogram, fallback bar, legends and SleepChart so it reads distinctly from light sleep (#a78bfa). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>