Stabilize iOS scanner and persist scanned words

Add handwriting AI review and five-question word batches

Reject OCR fragments and verify handwritten vocabulary

Fix handwritten word recognition and verified vocabulary

Update Chenguang learning platform

Complete on-device English notebook scanner

Refine Chenguang task-focused learning experience

Complete grade two and three learning flows

Make curriculum unit cards interactive

Refresh sentence support UI and bust mobile cache

Improve sentence practice and speech matching

Add child-friendly quiz explanations and zhuyin

Improve English phonetics and answer feedback

Add family birthday login

Fix Hugging Face static navigation

Finish English learning flows and direct routes