Update email placeholder from 'teacher' to 'email' in auth forms

Author: html-proof

src/app/auth/forgot-password/page.tsx

@@ -109,7 +109,7 @@ export default function ForgotPasswordPage() {
                                     border: "1px solid var(--border)",
                                     fontFamily: "inherit"
                                 }}
-                                placeholder="teacher@university.edu"
+                                placeholder="email@university.edu"
                             />
                         </div>
                     </div>

src/app/auth/login/page.tsx

@@ -81,7 +81,7 @@ export default function LoginPage() {
                                     color: "var(--text-main)",
                                     fontFamily: "inherit"
                                 }}
-                                placeholder={`teacher${CONFIG.ALLOWED_EMAIL_DOMAIN}`}
+                                placeholder={`email${CONFIG.ALLOWED_EMAIL_DOMAIN}`}
                             />
                         </div>
                     </div>

src/app/auth/signup/page.tsx

@@ -140,7 +140,7 @@ export default function SignupPage() {
                                     color: "var(--text-main)",
                                     fontFamily: "inherit"
                                 }}
-                                placeholder={`teacher${CONFIG.ALLOWED_EMAIL_DOMAIN}`}
+                                placeholder={`email${CONFIG.ALLOWED_EMAIL_DOMAIN}`}
                             />
                         </div>
                     </div>