fix: replace hardcoded LaTeX normalization with remark plugin

Author: ServeurpersoCom

tools/server/webui/src/lib/components/app/misc/MarkdownContent.svelte

@@ -15,6 +15,7 @@
 	import githubLightCss from 'highlight.js/styles/github.css?inline';
 	import { mode } from 'mode-watcher';
 	import { remarkLiteralHtml } from '$lib/markdown/literal-html';
+	import { remarkMathJaxDelimiters } from '$lib/markdown/mathjax-delimiters';
 
 	interface Props {
 		content: string;
@@ -49,6 +50,7 @@
 	let processor = $derived(() => {
 		return remark()
 			.use(remarkGfm) // GitHub Flavored Markdown
+			.use(remarkMathJaxDelimiters) // Normalize \[\] and \(\) delimiters inside text nodes
 			.use(remarkMath) // Parse $inline$ and $$block$$ math
 			.use(remarkBreaks) // Convert line breaks to <br>
 			.use(remarkLiteralHtml) // Treat raw HTML as literal text with preserved indentation

tools/server/webui/src/lib/markdown/mathjax-delimiters.ts

@@ -0,0 +1,33 @@
+import type { Plugin } from 'unified';
+import { visit } from 'unist-util-visit';
+import type { Root, Text } from 'mdast';
+
+const BLOCK_REGEX = /(^|[^\\])\\\[((?:\\.|[\s\S])*?)\\\]/g;
+const INLINE_REGEX = /(^|[^\\])\\\(((?:\\.|[\s\S])*?)\\\)/g;
+
+/**
+ * remark plugin that normalizes MathJax bracket delimiters into KaTeX-compatible
+ * dollar-delimited math nodes. The transformation only touches plain text nodes,
+ * preserving code blocks, inline code, and other literal sections handled
+ * elsewhere in the pipeline.
+ */
+
+export const remarkMathJaxDelimiters: Plugin<[], Root> = () => {
+	return (tree) => {
+		visit(tree, 'text', (node: Text) => {
+			const value = node.value;
+
+			if (!value || (!value.includes('\\[') && !value.includes('\\('))) {
+				return;
+			}
+
+			node.value = value
+				.replace(BLOCK_REGEX, (_, prefix: string, content: string) => {
+					return `${prefix}$$${content}$$`;
+				})
+				.replace(INLINE_REGEX, (_, prefix: string, content: string) => {
+					return `${prefix}$${content}$`;
+				});
+		});
+	};
+};