Fix modal width mismatch with content

- Remove padding from Modal's .content wrapper (let children control)
- Remove conflicting width/max-width from SchoolSearchModal
- Modal size classes now properly control the width

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

nextjs-app/components/SchoolSearchModal.module.css

@@ -1,7 +1,5 @@
 .modalContent {
-  padding: 2rem;
-  max-width: 600px;
-  width: 90vw;
+  padding: 1.5rem;
 }
 
 .title {
@@ -182,8 +180,7 @@
 /* Responsive */
 @media (max-width: 768px) {
   .modalContent {
-    padding: 1.5rem;
-    width: 95vw;
+    padding: 1rem;
   }
 
   .title {