feat: Add MATLAB syntax highlighting support for code blocks (#20773)

* 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

src/lib/components/common/CodeEditor.svelte

@@ -104,6 +104,12 @@
 		})
 	);
 
+	// Add 'matlab' alias to Octave language (MATLAB-compatible syntax)
+	const octaveLang = languages.find((l) => l.name === 'Octave');
+	if (octaveLang && !octaveLang.alias.includes('matlab')) {
+		octaveLang.alias.push('matlab');
+	}
+
 	const getLang = async () => {
 		const language = languages.find((l) => l.alias.includes(lang));
 		return await language?.load();