Refactor note rendering and add class archive support

[AliBenrami]

Summary

• Split the note editor into smaller block-focused modules for code, math, Mermaid, clipboard, selection, and rendering helpers.
• Fix note rendering so inline Markdown markers like bold, links, and code render correctly in generated notes instead of leaking raw syntax.
• Improve block selection so text selection inside note content is handled more reliably and no longer fights block drag behavior as often.
• Add a real class archive action, hide archived classes from the classes list, and surface class editing in the class detail sidebar.
• Tune note generation to produce fewer, denser topic notes with more content per note.

Testing

• Added and updated unit coverage for note parsing, records normalization, generation density, selection geometry, and note editor behavior.
• Verified the note-focused test suite and TypeScript checks pass locally.
• Ran lint; remaining warnings are limited to pre-existing unused imports in quiz and flashcard clients.

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Project	Deployment	Actions	Updated (UTC)
task-master	Ready	Preview, Comment	Jun 9, 2026 3:50am