Complete the astrolabe lesson curriculum

[jbeshir]

Summary

• replace face-based lesson sections and disabled future cards with one ordered nine-lesson curriculum
• add complete lessons for solar events, front temporal hours, transferring measured altitude, equation-of-time conversion, and shadow-square height measurement
• connect lesson highlights to the rendered unequal-hour, equation-of-time, and shadow-square geometry
• test solar horizon/meridian events, date-rule alignment, temporal-hour IX, altitude transfer, equation-of-time sign/radial, and the 45-degree 1:1 shadow-square construction

Validation

• npm test (230 tests)
• npm run build
• node ../../scripts/validate-widgets.mjs
• browser journey: 60 viewport/theme cells, including launch checks for every added lesson