search_library_courses was walking via list_library_directory, which
computes a full recursive file count (rglob) and thumbnail lookup for
every course at every level - turning a search into an O(every file in
every course) scan regardless of how few results actually match. Give
search its own lightweight directory-only walk and defer the expensive
per-course lookups until after a name match is confirmed, so cost now
scales with matches found rather than total library size.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Eight usability additions on top of the mobile redesign: course cover-image
thumbnails, a debounced library search, a Continue Watching section split
from Recently Viewed, per-lesson playback speed control, an installable
PWA manifest/icons, name sort in the library browser, per-lesson notes, and
a bulk mark-course-as-watched action. Also fixes two real bugs found along
the way: lesson_view.html was missing the viewport meta tag (so lesson
pages weren't actually mobile-responsive), and update_lesson_progress
always overwrote the whole progress entry, which would have silently
deleted a saved note on the next routine autosave.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
rmsitzandClaude Sonnet 5