feat(webui): improve LaTeX rendering with currency detection (#16508)

* webui : Revised LaTeX formula recognition

* webui : Further examples containg amounts

* webui : vitest for maskInlineLaTeX

* webui: Moved preprocessLaTeX to lib/utils

* webui: LaTeX in table-cells

* chore: update webui build output (use theirs)

* webui: backslash in LaTeX-preprocessing

* chore: update webui build output

* webui: look-behind backslash-check

* chore: update webui build output

* Apply suggestions from code review

Code maintenance (variable names, code formatting, string handling)

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

* webui: Moved constants to lib/constants.

* webui: package woff2 inside base64 data

* webui: LaTeX-line-break in display formula

* chore: update webui build output

* webui: Bugfix (font embedding)

* webui: Bugfix (font embedding)

* webui: vite embeds assets

* webui: don't suppress 404 (fonts)

* refactor: KaTeX integration with SCSS

Moves KaTeX styling to SCSS for better customization and font embedding.

This change includes:
- Adding `sass` as a dev dependency.
- Introducing a custom SCSS file to override KaTeX variables and disable TTF/WOFF fonts, relying solely on WOFF2 for embedding.
- Adjusting the Vite configuration to resolve `katex-fonts` alias and inject SCSS variables.

* fix: LaTeX processing within blockquotes

* webui: update webui build output

---------

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

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

@@ -8,8 +8,9 @@
 	import rehypeKatex from 'rehype-katex';
 	import rehypeStringify from 'rehype-stringify';
 	import { copyCodeToClipboard } from '$lib/utils/copy';
+	import { preprocessLaTeX } from '$lib/utils/latex-protection';
 	import { browser } from '$app/environment';
-	import 'katex/dist/katex.min.css';
+	import '$styles/katex-custom.scss';
 
 	import githubDarkCss from 'highlight.js/styles/github-dark.css?inline';
 	import githubLightCss from 'highlight.js/styles/github.css?inline';
@@ -176,19 +177,9 @@
 		return mutated ? tempDiv.innerHTML : html;
 	}
 
-	function normalizeMathDelimiters(text: string): string {
-		return text
-			.replace(/(^|[^\\])\\\[((?:\\.|[\s\S])*?)\\\]/g, (_, prefix: string, content: string) => {
-				return `${prefix}$$${content}$$`;
-			})
-			.replace(/(^|[^\\])\\\(((?:\\.|[\s\S])*?)\\\)/g, (_, prefix: string, content: string) => {
-				return `${prefix}$${content}$`;
-			});
-	}
-
 	async function processMarkdown(text: string): Promise<string> {
 		try {
-			const normalized = normalizeMathDelimiters(text);
+			let normalized = preprocessLaTeX(text);
 			const result = await processor().process(normalized);
 			const html = String(result);
 			const enhancedLinks = enhanceLinks(html);