feat: module list completion tracking, quiz navigation, results screen, reward history filters

[TheHalalHunter]

Summary

Closes #273, Closes #274, Closes #275, Closes #276.

---

#273 — ModuleList completion tracking (module-list.tsx)

• Quiz badge: violet pill on contentType: 'interactive' modules; blue pill on contentType: 'video'
• Content-type icon in the trailing column alongside duration
• Dark mode fixes for completed/active title text and status icons
• All existing features preserved: checkmark, current-module highlight, lock for inaccessible, click-to-navigate

#274 — QuizInterface question navigation (quiz-interface.tsx)

• Dot navigation bar — gray (unanswered), light primary (answered), scaled primary (current); click any dot to jump
• Answered counter (X/N answered) and optional time limit in header
• Inline submission error display with Loader2 spinner during submit
• Consolidated retry flow — removed duplicate retry buttons

#275 — ResultsScreen quiz results (results-screen.tsx — new file)

• Circular score ring with colour-coded threshold (green / amber / red), fraction display, pass/fail Badge
• Bouncing trophy on pass (animate-bounce)
• Per-question breakdown: your answer, correct answer, explanation for wrong answers
• Token reward banner when rewardClaimed is true
• Action footer: pass → continue to next module (derived from store) or back to course; fail → retry + back to course
• QuizInterface updated to render <ResultsScreen> instead of inline block; quiz page threads courseId

#276 — RewardHistory filters + export (reward-history.tsx, dashboard/page.tsx)

• Summary stats: total LEARN earned, confirmed count, pending count, failed count (always over full unfiltered list)
• Filter bar: course search (debounced 250ms), status select, date-from / date-to — all combinable via useMemo
• Export CSV: downloads filtered list as reward-history-YYYY-MM-DD.csv
• Status Badge pills on each row (success / warning / destructive)
• RewardHistory wired into the dashboard rewards tab

Files changed

• src/components/course/module-list.tsx
• src/components/course/quiz-interface.tsx
• src/components/course/results-screen.tsx (new)
• src/app/courses/[courseId]/quiz/page.tsx
• src/components/rewards/reward-history.tsx
• src/app/dashboard/page.tsx

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