Adds Recharts-based calorie and macro trend charts plus real
calendar-week (Mon-Sun) averages, replacing the old rolling
7-day average. Colors were chosen and validated with the dataviz
skill's contrast/CVD checks separately for light and dark mode.
Fixes a timezone bug where Date.toISOString() shifted week
boundaries by one day in UTC+ timezones, and two Recharts pitfalls
(negative chart margin hiding the Y-axis, mount animation stuck
invisible in headless browsers).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Jakob
