- Fix Monarch tokenizer loading: await initLinter() before editor creation
so loadScript() doesn't clobber window.define during lazy tokenizer init
- Fix JSX/TSX coloring: use file URIs with proper extensions (.jsx/.tsx)
so Monaco enables JSX tokenization via the TypeScript language service
- Modernize toolbar: move settings to gear popover, replace text buttons
with SVG icons, consolidate toggle checkboxes into compact group
- Clean up CSS: remove duplicate toggle classes, dead selectors, orphaned rules
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