Revert "Allow acm.illinois.edu emails for leads"

This reverts commit 263fead.

Author: devksingh4

src/common/types/organizations.ts

@@ -6,8 +6,8 @@ import { z } from "zod/v4";
 export const orgLeadEntry = z.object({
   name: z.optional(z.string()),
   username: z.email().refine(
-    (email) => email.endsWith('@illinois.edu') || email.endsWith('@acm.illinois.edu'),
-    { message: 'Email must be from the @illinois.edu or @acm.illinois.edu domain' }
+    (email) => email.endsWith('@illinois.edu'),
+    { message: 'Email must be from the @illinois.edu domain' }
   ),
   title: z.optional(z.string())
 })

src/ui/pages/organization/ManageOrganizationForm.tsx

@@ -455,8 +455,8 @@ export const ManageOrganizationForm: React.FC<ManageOrganizationFormProps> = ({
                 />
                 <TextInput
                   label="Lead Email"
-                  description="You must use an @illinois.edu or @acm.illinois.edu email"
-                  placeholder="user@illinois.edu"
+                  description="Please use their Illinois email!"
+                  placeholder="email@illinois.edu"
                   value={newLeadEmail}
                   onChange={(e) => setNewLeadEmail(e.currentTarget.value)}
                 />