Check for valid urls.

src/lib/schema.ts

@@ -36,6 +36,20 @@ export const unitParam = z.string().refine(value => UNIT_TYPES.includes(value),
 
 export const roleParam = z.enum(['team-member', 'team-view-only', 'team-manager']);
 
+export const urlOrPathParam = z.string().refine(
+  value => {
+    try {
+      new URL(value, 'https://localhost');
+      return true;
+    } catch {
+      return false;
+    }
+  },
+  {
+    message: 'Invalid URL.',
+  },
+);
+
 export const reportTypeParam = z.enum([
   'funnel',
   'insights',