fix: Auto-remove spaces from Gmail App Password

- Google provides App Password with spaces (e.g. 'abcd efgh ijkl mnop')
- Backend now automatically removes all spaces before saving
- Users can paste password directly from Google without manual cleanup
- Also trim gmail_user for safety

backend/src/controllers/settings.controller.js

@@ -30,16 +30,18 @@ exports.updateGmailSettings = async (req, res, next) => {
     if (gmail_user) {
       await Settings.upsert({
         key: 'gmail_user',
-        value: gmail_user,
+        value: gmail_user.trim(),
         is_encrypted: false,
         description: 'Gmail email address',
       });
     }
 
     if (gmail_app_password) {
+      // Remove all spaces from App Password (Google gives it with spaces)
+      const cleanPassword = gmail_app_password.replace(/\s+/g, '');
       await Settings.upsert({
         key: 'gmail_password',
-        value: gmail_app_password,
+        value: cleanPassword,
         is_encrypted: true,
         description: 'Gmail App Password',
       });