fix: add password reuse check and update styling

Author: yaroslav8765

custom/SetPassword.vue

@@ -37,7 +37,7 @@
                 <!-- Modal body -->
                 <div class="p-4 md:p-5">
                   <!-- Success message -->
-                  <div v-if="passwordSet" class="af-alert-success flex items-center justify-center p-4 mb-4 text-sm text-green-800 rounded-lg bg-green-50 dark:bg-green-800 dark:text-green-400" role="alert">
+                  <div v-if="passwordSet" class="af-alert-success flex items-center justify-center p-4 mb-4 text-sm rounded-lg dark:text-white" role="alert">
                     <div class="text-center">
                       <p class="mb-3">{{$t('Password set successfully!')}}</p>
                       <Link to="/login" class="inline-flex items-center px-4 py-2 text-sm font-medium text-white bg-blue-600 border border-transparent rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500">

index.ts

@@ -259,11 +259,13 @@ export default class EmailInvitePlugin extends AdminForthPlugin {
             );
             userRecord = records.length > 0 ? records[0] : null;
           }
-          
           if (!userRecord) {
             return { error: 'User not found', ok: false };
           }
 
+          if ( userRecord[this.options.emailConfirmedField] ) {
+            return { error: 'Password already set. Invitation link cannot be reused.', ok: false };
+          }
           const userEmail = userRecord[this.options.emailField];
           const tokenEmail = email;