The scanner no longer assumes courses sit at a fixed depth. It walks
each branch and marks a folder is_course when it holds media directly
or its children read as chapters (01_, 1. , Module 2, Week 3);
everything above that is a category, and every folder still gets a
course_id pointing at its nearest course for cheap rollups. An empty
.course/.category marker file overrides the heuristic per folder.
Also:
- Roll up progress for the whole library in two grouped queries
instead of one prefix-matched query per course/folder card.
- Store folders/videos/quizzes paths as utf8mb4_bin so folders that
differ only in case (CCNP Notes vs CCNP NOtes) aren't merged by a
case-insensitive UNIQUE key.
- migrateLibrarySchema() brings an older install's tables up to date
at scan time, so there's no separate migration step.
- Library UI gains a categories view alongside shelves/catalog; the
continue-watching strip's play button now seeks to the saved
position on open.
Claude-Session: https://claude.ai/code/session_01FfMPJK7TQV18JhFv6yTKev
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