🔒 CRITICAL SECURITY FIX: Remove password storage in localStorage

SECURITY VULNERABILITY FIXED:
Registration form was storing passwords in plain text in localStorage,
creating a severe XSS vulnerability where attackers could steal credentials.

Changes Made:
1. **RegisterForm.tsx:**
   - REMOVED localStorage persistence of registration_progress (lines 110-146)
   - Password, email, and all form data now kept in memory only
   - Added cleanup effect to remove any existing registration_progress data
   - Form data is submitted directly to backend via secure API calls

2. **WizardContext.tsx:**
   - REMOVED localStorage persistence of wizard state (lines 98-116)
   - All onboarding progress now tracked exclusively via backend API
   - Added cleanup effect to remove any existing wizardState data
   - Updated resetWizard to not reference localStorage

3. **Architecture Change:**
   - All user data and progress tracking now uses backend APIs exclusively
   - Backend APIs already exist: /api/v1/auth/register, onboarding_progress.py
   - No sensitive data stored in browser localStorage

Impact:
- Prevents credential theft via XSS attacks
- Ensures data security and consistency across sessions
- Aligns with security best practices (OWASP guidelines)

Backend Support:
- services/auth/app/api/auth_operations.py handles registration
- services/auth/app/api/onboarding_progress.py tracks wizard progress
- All data persisted securely in PostgreSQL database

frontend/src/components/domain/auth/RegisterForm.tsx

@@ -108,43 +108,20 @@ export const RegisterForm: React.FC<RegisterFormProps> = ({
     loadPlanMetadata();
   }, [selectedPlan]);
 
-  // Save form progress to localStorage
+  // SECURITY: Removed localStorage usage for registration progress
+  // Registration form data (including passwords) should NEVER be stored in localStorage
+  // due to XSS vulnerability risks. Form state is kept in memory only and submitted
+  // directly to backend via secure API calls.
+
+  // Clean up any old registration_progress data on mount (security fix)
   useEffect(() => {
-    const formState = {
-      formData,
-      selectedPlan,
-      useTrial,
-      currentStep,
-      timestamp: Date.now(),
-    };
-    localStorage.setItem('registration_progress', JSON.stringify(formState));
-  }, [formData, selectedPlan, useTrial, currentStep]);
-
-  // Recover form state on mount (if less than 24 hours old)
-  useEffect(() => {
-    // Only recover if not coming from a direct link with plan pre-selected
-    if (preSelectedPlan) return;
-
-    const saved = localStorage.getItem('registration_progress');
-    if (saved) {
-      try {
-        const state = JSON.parse(saved);
-        const age = Date.now() - state.timestamp;
-        const maxAge = 24 * 60 * 60 * 1000; // 24 hours
-
-        if (age < maxAge) {
-          // Optionally restore state (for now, just log it exists)
-          console.log('Found saved registration progress');
-        } else {
-          // Clear old state
-          localStorage.removeItem('registration_progress');
-        }
-      } catch (err) {
-        console.error('Failed to parse saved registration state:', err);
-        localStorage.removeItem('registration_progress');
-      }
+    try {
+      localStorage.removeItem('registration_progress');
+      localStorage.removeItem('wizardState'); // Clean up wizard state too
+    } catch (err) {
+      console.error('Error cleaning up old localStorage data:', err);
     }
-  }, [preSelectedPlan]);
+  }, []);
 
   const validateForm = (): boolean => {
     const newErrors: Partial<SimpleUserRegistration> = {};

frontend/src/components/domain/onboarding/context/WizardContext.tsx

@@ -95,23 +95,18 @@ export const WizardProvider: React.FC<WizardProviderProps> = ({
     startedAt: providedInitialState?.startedAt || new Date().toISOString(),
   });
 
-  // Persist state to localStorage
-  useEffect(() => {
-    if (state.startedAt) {
-      localStorage.setItem('wizardState', JSON.stringify(state));
-    }
-  }, [state]);
+  // SECURITY: Removed localStorage persistence for wizard state
+  // All onboarding progress is now tracked exclusively via backend API
+  // (services/auth/app/api/onboarding_progress.py) to ensure data security
+  // and consistency across sessions. No wizard data is stored locally.
 
-  // Load persisted state on mount
+  // Clean up any old wizardState data on mount (security fix)
   useEffect(() => {
-    const persistedState = localStorage.getItem('wizardState');
-    if (persistedState) {
-      try {
-        const parsed = JSON.parse(persistedState);
-        setState(prev => ({ ...prev, ...parsed }));
-      } catch (error) {
-        console.error('Failed to parse persisted wizard state:', error);
-      }
+    try {
+      localStorage.removeItem('wizardState');
+      localStorage.removeItem('registration_progress');
+    } catch (err) {
+      console.error('Error cleaning up old localStorage data:', err);
     }
   }, []);
 
@@ -224,7 +219,7 @@ export const WizardProvider: React.FC<WizardProviderProps> = ({
       ...initialState,
       startedAt: new Date().toISOString(),
     });
-    localStorage.removeItem('wizardState');
+    // No localStorage cleanup needed - we don't store wizard state locally anymore
   };
 
   const value: WizardContextValue = {