feat: Add LaTeX support to the markdown renderer

Adds LaTeX support to the markdown renderer using `rehype-katex` for math equations.

- Replaces block-level LaTeX delimiters `\[ \]` with `$$ $$`.
- Replaces inline LaTeX delimiters `\( \)` with `$ $`.
- Preprocesses the message before rendering to ensure correct delimiters.

This improves the rendering of markdown messages containing mathematical expressions, enhancing the user experience.

wxt.config.ts

@@ -50,7 +50,7 @@ export default defineConfig({
   outDir: "build",
 
   manifest: {
-    version: "1.2.2",
+    version: "1.2.3",
     name:
       process.env.TARGET === "firefox"
         ? "Page Assist - A Web UI for Local AI Models"