Spaced Repetition Review Mode

[Aditya8369]

Tasks

Step 1 — Add review schedule storage + spaced repetition logic

• File: progress.js
• Add localStorage key: learnsphere_review_schedule_v1
• Implement helpers: load/save schedule, get nextReviewDate/interval, due calculation
• Implement recordReviewResult(topicId, scorePct, answeredCount) using simple spaced repetition rule

Step 2 — Add “Review” CTA per topic in UI

• File: progress.js
• Update renderProgressList() to render a Review button per topic
• Button enabled only when review is due
• Button label shows Review or Review in Xd

Step 3 — Implement review.js quiz runner + modal UI integration

• Add new file: review.js
• Add review modal container markup to home.html
• Provide short review quiz (topic-scoped) and callback on finish
• After quiz: call spaced repetition update and refresh list

Step 4 — Optional: show due reviews in “My Progress”

• Files: my_progress.html, my_progress.js
• Add a small widget: Due reviews: N and/or next review date

closes #60

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