tiennm99 9d5d3f04a0 feat: 3 interactive demo pages + transforms/sieve/linear engines ...

Lessons:
- /hinh-hoc/dinh-ly-pythagoras (lớp 7) — drag right-angle vertex; "Chứng minh"
  button plays Euclid-style dissection-shear animation tweening two leg-squares
  into the hypotenuse-square. Respects prefers-reduced-motion.
- /so-hoc/sang-eratosthenes (lớp 6) — 10×10 grid; click 2/3/5/7 → ripple
  cross-out of multiples in 4 colors; roving tabindex; aria-live announces.
- /dai-so/duong-thang (lớp 7) — y = ax + b plot; 2 sliders + 2 draggable
  anchors bidirectionally bound via draggable.onChange + viewport clamping +
  rounded epsilon gate (no oscillation at any drag speed).

Engines:
- geom-engine/transforms.js — translate, rotate, shear, compose, applyToPolygon (13 tests)
- numtheory-engine/sieve.js — sieveUpTo, multiplesOf, isPrime (10 tests)
- algebra-engine/linear.js — lineFromPoints, yAt, linePoints (6 tests); new module bootstrapped

Glue:
- registry: insert 3 new lessons in topic+grade order
- tailwind: extend colors.pair to 4 entries (pair.4 = #5E60CE for prime 7)
- README: bump count 5→8, list new URLs, update architecture section

2026-05-15 20:35:22 +07:00

..

lib

feat: 3 interactive demo pages + transforms/sieve/linear engines

2026-05-15 20:35:22 +07:00

routes

feat: 3 interactive demo pages + transforms/sieve/linear engines

2026-05-15 20:35:22 +07:00

app.css

feat: port 3 interactive geometry lessons + geom-engine

2026-04-30 22:27:26 +07:00

app.html

feat: initial scaffold

2026-04-30 21:44:43 +07:00