Fix: Add defensive guards to middleware for prerender safety

Use optional chaining and try-catch to safely handle cases where starlightRoute is not available during prerender.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: isvictorious

src/middleware.ts

@@ -1,9 +1,13 @@
 import { defineMiddleware } from 'astro:middleware';
 
 export const onRequest = defineMiddleware((context, next) => {
-  // Set custom logo link to main site instead of docs
-  if (context.locals.starlightRoute) {
-    context.locals.starlightRoute.siteTitleHref = 'https://www.tigerdata.com';
+  try {
+    // Set custom logo link to main site instead of docs
+    if (context.locals?.starlightRoute) {
+      context.locals.starlightRoute.siteTitleHref = 'https://www.tigerdata.com';
+    }
+  } catch {
+    // Safely handle cases where starlightRoute is not available (e.g., 404 prerender)
   }
   return next();
 });