Implements a canvas-based timeline view with D3 scales showing class
counts across subjects. Features drag-to-pan, mouse wheel zoom, subject
filtering, hover tooltips, and smooth animations. Timeline auto-follows
current time and supports keyboard navigation.
Replaces duplicated dropdown/context menu code with parameterized snippet,
eliminates unsafe type casts, adds error handling for clipboard and API
calls, and improves accessibility annotations.
Integrate ts-rs for Rust-to-TypeScript type generation, build course
search page with filters, pagination, and expandable detail rows,
and refactor theme toggle into a reactive store with view transition
animation.
