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/vite.config.ts

@@ -18,6 +18,15 @@ const GUIDE_FOR_FRONTEND = `
 
 const MAX_BUNDLE_SIZE = 2 * 1024 * 1024;
 
+/**
+ * the maximum size of an embedded asset in bytes,
+ * e.g. maximum size of embedded font (see node_modules/katex/dist/fonts/*.woff2)
+ */
+const MAX_ASSET_SIZE = 32000;
+
+/** public/index.html.gz minified flag */
+const ENABLE_JS_MINIFICATION = true;
+
 function llamaCppBuildPlugin() {
 	return {
 		name: 'llamacpp:build',
@@ -75,12 +84,28 @@ function llamaCppBuildPlugin() {
 }
 
 export default defineConfig({
-	build: {
-		chunkSizeWarningLimit: 3072
+	resolve: {
+		alias: {
+			'katex-fonts': resolve('node_modules/katex/dist/fonts')
+		}
+	},
+	build: {
+		assetsInlineLimit: MAX_ASSET_SIZE,
+		chunkSizeWarningLimit: 3072,
+		minify: ENABLE_JS_MINIFICATION
+	},
+	css: {
+		preprocessorOptions: {
+			scss: {
+				additionalData: `
+					$use-woff2: true;
+					$use-woff: false;
+					$use-ttf: false;
+				`
+			}
+		}
 	},
-
 	plugins: [tailwindcss(), sveltekit(), devtoolsJson(), llamaCppBuildPlugin()],
-
 	test: {
 		projects: [
 			{