fix: improve onboarding UX and fix order sync error

- Remove redundant 1/4 progress counter from header
- Make step indicators mobile-friendly (smaller circles, hidden labels)
- Add CSV URL help text pointing to Letzshop Admin > API > Export Products
- Fix AttributeError in order sync progress (use correct model attributes)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/onboarding_service.py

@@ -541,28 +541,31 @@ class OnboardingService:
         elif job.status == "failed":
             progress = 0
         elif job.status == "processing":
-            if job.total_shipments and job.total_shipments > 0:
-                progress = int((job.processed_shipments or 0) / job.total_shipments * 100)
+            # Use orders_processed and shipments_fetched for progress
+            total = job.shipments_fetched or 0
+            processed = job.orders_processed or 0
+            if total > 0:
+                progress = int(processed / total * 100)
             else:
                 progress = 50  # Indeterminate
+        elif job.status == "fetching":
+            # Show partial progress during fetch phase
+            if job.total_pages and job.total_pages > 0:
+                progress = int((job.current_page or 0) / job.total_pages * 50)
+            else:
+                progress = 25  # Indeterminate
 
         # Determine current phase
-        current_phase = None
-        if job.status == "fetching":
-            current_phase = "fetching"
-        elif job.status == "processing":
-            current_phase = "orders"
-        elif job.status == "completed":
-            current_phase = "complete"
+        current_phase = job.current_phase or job.status
 
         return {
             "job_id": job.id,
             "status": job.status,
             "progress_percentage": progress,
             "current_phase": current_phase,
-            "orders_imported": job.processed_shipments or 0,
-            "orders_total": job.total_shipments,
-            "products_imported": 0,  # TODO: Track this
+            "orders_imported": job.orders_imported or 0,
+            "orders_total": job.shipments_fetched,
+            "products_imported": job.products_matched or 0,
             "started_at": job.started_at,
             "completed_at": job.completed_at,
             "estimated_remaining_seconds": None,  # TODO: Calculate