style: use catppuccin-mocha theme for syntax highlighting

- Add markdown.theme config for better code block contrast
- Update code block background to catppuccin crust (#11111b)
- Improves readability on dark background with warm color palette

Author: robcohen

docs/.vitepress/config.js

@@ -7,6 +7,10 @@ export default defineConfig({
     base: '/',
     appearance: false,
 
+    markdown: {
+        theme: 'catppuccin-mocha',
+    },
+
     head: [['link', { rel: 'icon', type: 'image/svg+xml', href: '/favicon.svg' }]],
 
     themeConfig: {

docs/.vitepress/theme/custom.css

@@ -45,8 +45,8 @@
     --vp-c-divider: rgba(255, 255, 255, 0.1);
     --vp-c-gutter: rgba(255, 255, 255, 0.05);
 
-    /* Code blocks */
-    --vp-code-block-bg: #0a0a0a;
+    /* Code blocks - using catppuccin-mocha crust for cohesion */
+    --vp-code-block-bg: #11111b;
     --vp-code-line-highlight-color: rgba(249, 115, 22, 0.1);
 
     /* Sidebar */

pta-standards

@@ -0,0 +1 @@
+../pta-standards