Spruce up contact and repair request forms, fix Docker build timeouts

- Contact page: two-column layout with rover image and email card sidebar
- Repair request: hero section, "How it works" steps sidebar, return address
  field, warranty/charges checkbox
- Reduce static generation concurrency to prevent Docker build timeouts
- Bump staticPageGenerationTimeout to 300s

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

next.config.ts

@@ -2,7 +2,11 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
   output: "standalone",
-  staticPageGenerationTimeout: 120,
+  staticPageGenerationTimeout: 300,
+  experimental: {
+    staticGenerationMaxConcurrency: 8,
+    staticGenerationMinPagesPerWorker: 25,
+  },
 };
 
 export default nextConfig;