refactor(course): Isolate lesson content types through router orchestration#53

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syed-tp wants to merge 2 commits intoref/dio-singletonfrom

ref/lesson-detail

Commits on Apr 1, 2026

refactor: replace redundant LessonDetailScreen with router-level orchestration and specialized content screens
syed-tp
committed
feat: add empty state to PdfLessonDetailScreen and update specification documentation
syed-tp
committed