fix(build): fail the build when SSR rendering errors occur

src/client/app/ssr.ts

@@ -7,6 +7,30 @@ export async function render(path: string) {
   const { app, router } = await createApp()
   await router.go(path)
   const ctx: SSGContext = { content: '', vpSocialIcons: new Set<string>() }
+
+  // Vue's SSR renderer reports component errors through the app's error
+  // handler and continues rendering instead of rejecting renderToString,
+  // which would silently ship broken pages. Collect the errors and fail
+  // the build instead.
+  const errors: [unknown, string][] = []
+  const userErrorHandler = app.config.errorHandler
+  app.config.errorHandler = (err, instance, info) => {
+    errors.push([err, info])
+    userErrorHandler?.(err, instance, info)
+  }
+
   ctx.content = await renderToString(app, ctx)
+
+  if (errors.length) {
+    const details = errors
+      .map(([err, info]) =>
+        err instanceof Error
+          ? `[${info}] ${err.stack || err.message}`
+          : `[${info}] ${String(err)}`
+      )
+      .join('\n')
+    throw new Error(`Errors during SSR rendering of ${path}:\n${details}`)
+  }
+
   return ctx
 }