Oikos

Added

• Menstrual cycle tracking in the Health module — a new "Cycle" tab (/health/cycle, the sixth Health sub-tab) records period episodes (start/end + flow) and per-day logs (bleeding intensity, symptoms, mood, note), and computes calendar-method predictions of the next period, ovulation, and the fertile window. A native SVG cycle ring shows the current phase, cycle day, and countdown; a month calendar colour-codes logged and predicted periods, the fertile window, and ovulation; prediction stat cards, a "today" quick-capture bar, a period history, per-member prediction settings (cycle/period/luteal length, fertility toggle), and CSV export round it out. Cycle data defaults to private visibility and shares the module's person switcher and read-only foreign views. The fertile window carries a clear disclaimer that it is not contraception and no substitute for medical advice; cycle data is deliberately kept out of global search and the shared dashboard (#450).