fix(wiki): remove callout icon top margin and first-child spacing

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/app/(frontend)/styles.css

@@ -536,6 +536,11 @@
   padding: 0.75rem 1rem 0.75rem 2.5rem;
 }
 
+.wiki-markdown .note > :first-child,
+.wiki-markdown .warning > :first-child {
+  margin-top: 0;
+}
+
 .wiki-markdown .note .callout-icon {
   position: absolute;
   left: 0.75rem;

src/lib/wiki/markdown.tsx

@@ -128,7 +128,7 @@ export const wikiMarkdownComponents: Components = {
 
     return (
       <div className={className} data-directive={directiveName}>
-        {isCallout && <Icon className="callout-icon mt-0.5 size-4 shrink-0" aria-hidden="true" />}
+        {isCallout && <Icon className="callout-icon size-4 shrink-0" aria-hidden="true" />}
         {children}
       </div>
     );