Force session cookie persistence for login

- Added explicit session save using session_interface
- Enhanced session debugging to track data persistence
- Removed Safari-specific cookie handling that may interfere
- Force session save before redirect to ensure data persists

api.py

@@ -1503,7 +1503,12 @@ def login():
             session.permanent = True
             session.modified = True  # 세션 변경 사항 즉시 적용
             
+            # Debug session data after setting
             print(f"Login successful for user: {username}, ID: {user.id}")
+            print(f"Session data after login: {dict(session)}")
+            
+            # Force session save by accessing it
+            _ = session.get('user_id')
             
             # 리디렉션 처리
             next_page = request.args.get('next')
@@ -1511,18 +1516,20 @@ def login():
                 print(f"Redirecting to: {next_page}")
                 return redirect(next_page)
             print("Redirecting to index.html")
+            
+            # Create response with session cookie explicitly set
             response = make_response(redirect(url_for('serve_index_html')))
+            
+            # Force session cookie to be set for all browsers
+            from flask import current_app
+            session_interface = current_app.session_interface
+            session_interface.save_session(current_app, session, response)
+            
             # Set additional headers for HF Spaces compatibility
             response.headers['Cache-Control'] = 'no-cache, no-store, must-revalidate'
             response.headers['Pragma'] = 'no-cache'
             response.headers['Expires'] = '0'
             
-            # Safari-specific cookie handling - ensure session cookie is properly set
-            if 'Safari' in request.headers.get('User-Agent', ''):
-                # Force session cookie to be set with explicit domain
-                response.set_cookie('session', session.sid if hasattr(session, 'sid') else '', 
-                                  httponly=True, samesite='Lax', secure=request.is_secure)
-            
             return response
         else:
             error = 'Invalid username or password'