Added onboarding progress tracking & landing page

docs/STYLE_DETECTION_404_ANALYSIS.md

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+# Style Detection 404 Error Analysis
+**Date:** October 1, 2025  
+**Issue:** `GET /api/style-detection/session-analyses` returning 404 Not Found  
+**Impact:** Low - Feature degrades gracefully, no user-facing errors
+
+---
+
+## 🔍 Root Cause Analysis
+
+### **The Problem:**
+
+**Frontend calls:**
+```typescript
+// Line 252 in websiteUtils.ts
+const res = await fetch('/api/style-detection/session-analyses');
+```
+
+**Backend registered at:**
+```python
+# Line 43 in component_logic.py
+router = APIRouter(prefix="/api/onboarding", tags=["component_logic"])
+
+# Line 645 in component_logic.py
+@router.get("/style-detection/session-analyses")
+```
+
+**Actual endpoint:**
+```
+/api/onboarding/style-detection/session-analyses
+     ^^^^^^^^^^^^ Missing prefix!
+```
+
+**Frontend calling:**
+```
+/api/style-detection/session-analyses
+     ❌ No /onboarding prefix
+```
+
+**Result:** 404 Not Found ❌
+
+---
+
+## 📋 What Is This Endpoint?
+
+### **Purpose:**
+Pre-fill the website URL input field with the last analyzed website from the user's session.
+
+### **User Experience:**
+```
+User Journey:
+1. User analyzes website: example.com (Step 2)
+2. User completes onboarding
+3. User starts new session / refreshes page
+4. Returns to Step 2 (Website Analysis)
+5. ✅ Website field auto-filled with: example.com
+6. User doesn't have to type URL again
+```
+
+**UX Benefit:** Convenience feature - saves user from re-typing
+
+---
+
+## 🎯 Why It's Being Called
+
+### **Location:** `WebsiteStep.tsx` (Lines 192-206)
+
+```typescript
+useEffect(() => {
+  // Prefill from last session analysis on mount
+  const loadLastAnalysis = async () => {
+    const result = await fetchLastAnalysis();  // ← Calls the 404 endpoint
+    if (result.success) {
+      if (result.website) {
+        setWebsite(result.website);  // Auto-fill URL
+      }
+      if (result.analysis) {
+        setAnalysis(result.analysis);  // Load previous analysis
+      }
+    }
+  };
+  loadLastAnalysis();
+}, []);
+```
+
+**Trigger:** Component mounts (every time user visits Step 2)
+
+---
+
+## 📊 Current Impact
+
+### **User Experience:**
+- ✅ **No visible errors** - Error caught and handled gracefully
+- ✅ **Feature fails silently** - Just doesn't pre-fill
+- ✅ **User can still proceed** - Manual URL entry works fine
+- ⚠️ **Slightly inconvenient** - User must re-type URL
+
+### **System Impact:**
+- ⚠️ **Backend logs pollution** - 404 errors on every Step 2 visit
+- ⚠️ **Network noise** - Unnecessary failed requests
+- ✅ **No crashes** - Error handled properly
+
+**Severity:** 🟡 Low (convenience feature, not critical)
+
+---
+
+## 🔧 Solutions
+
+### **Option 1: Fix Frontend URL (Quick Fix - 30 seconds)**
+
+```typescript
+// frontend/src/components/OnboardingWizard/WebsiteStep/utils/websiteUtils.ts
+// Line 252
+
+// Before:
+const res = await fetch('/api/style-detection/session-analyses');
+
+// After:
+const res = await fetch('/api/onboarding/style-detection/session-analyses');
+//                        ^^^^^^^^^^^^ Add missing prefix
+```
+
+**Pros:**
+- ✅ Quick fix (1 line change)
+- ✅ Restores functionality
+- ✅ No breaking changes
+
+**Cons:**
+- None
+
+**Recommendation:** ✅ **Do this**
+
+---
+
+### **Option 2: Update Backend Route