fix: resolve TypeScript errors for Zod v4 API changes

src/components/sections/contact-section.tsx

@@ -60,7 +60,10 @@ export function ContactSection() {
       setErrors((prev) => ({ ...prev, [field]: undefined }));
     } catch (error) {
       if (error instanceof z.ZodError) {
-        setErrors((prev) => ({ ...prev, [field]: error.errors[0].message }));
+        const fieldError = error.issues[0];
+        if (fieldError) {
+          setErrors((prev) => ({ ...prev, [field]: fieldError.message }));
+        }
       }
     }
   };
@@ -83,9 +86,9 @@ export function ContactSection() {
     
     if (!result.success) {
       const fieldErrors: FormErrors = {};
-      result.error.errors.forEach((error) => {
-        const field = error.path[0] as keyof ContactFormData;
-        fieldErrors[field] = error.message;
+      result.error.issues.forEach((issue) => {
+        const field = issue.path[0] as keyof ContactFormData;
+        fieldErrors[field] = issue.message;
       });
       setErrors(fieldErrors);
       return;

src/components/sections/insights-section.tsx

@@ -114,7 +114,7 @@ export function InsightsSection() {
           `}
         >
           <Button
-            variant="outline"
+            variant="secondary"
             size="lg"
             className="group"
             onClick={() => window.location.href = '/insights'}