fix: strip .md extension from resolved article paths

Ensures that navigation to markdown files strips the extension,
allowing the SPA fallback to handle refreshes instead of requesting
the raw file.

src/components/Article.tsx

@@ -109,9 +109,14 @@ export const Article: Component<ArticleProps & ParentProps> = (props) => {
 
       e.preventDefault();
       // Resolve relative hrefs against the current page path so that
-      // e.g. "blah.md" on /content/page.md becomes /content/blah.md
-      const resolved = new URL(href, window.location.origin + window.location.pathname).pathname;
-      navigate(resolved);
+      // e.g. "blah.md" on /content/page.md becomes /content/blah
+      const resolved = new URL(href, window.location.origin + window.location.pathname);
+      let pathname = resolved.pathname;
+      // Strip .md extension so refreshes hit the SPA fallback, not the raw file
+      if (pathname.endsWith(".md")) {
+        pathname = pathname.slice(0, -3);
+      }
+      navigate(pathname + resolved.hash);
     };
 
     dom.addEventListener("click", onClick);