fix code block bleed alignment and line numbers

- Fixed --ll-bleed to 44px (8px padding + 36px line-number width, border-box)
- Line numbers fixed width 36px (always fits 3 digits, no layout shift)
- Line number opacity increased from 0.15 to 0.3 in both light and dark mode
- Commented out code block background

website/src/components/markdown.tsx

@@ -363,7 +363,7 @@ export function CodeBlock({ children, lang = "jsx" }: { children: string; lang?:
         <pre
           className="overflow-x-auto"
           style={{
-            background: "var(--ll-code-bg)",
+            // background: "var(--ll-code-bg)",
             borderRadius: "8px",
             margin: 0,
             padding: 0,
@@ -389,7 +389,7 @@ export function CodeBlock({ children, lang = "jsx" }: { children: string; lang?:
                 color: "var(--ll-code-line-nr)",
                 textAlign: "right",
                 paddingRight: "20px",
-                minWidth: "28px",
+                width: "36px",
                 userSelect: "none",
               }}
             >