Previous implementation created all ~589 shapes (year + months + weeks + days)
at once, causing visual chaos on load and broken zoom. New approach dynamically
creates/destroys shapes per level: year shows 12 months, month shows 6 weeks,
week shows 7 days, day shows time slots. Wheel prime pattern (2 ticks) prevents
accidental zooms. Double-click resets to year view.
Co-Authored-By: Claude <noreply@anthropic.com>
