* feat: Add MATLAB syntax highlighting support for code blocks
Add MATLAB syntax highlighting support by fixing issues in both CodeEditor (editable) and CodeBlock (read-only) components.
Changes:
- CodeEditor.svelte: Added 'matlab' alias to CodeMirror's Octave language (MATLAB-compatible syntax)
- CodeBlock.svelte: Fixed highlight.js usage to use highlight() directly when language is recognized, falling back to highlightAuto() only for unknown languages
* revert: not needed