fix: redirect to /setup/unresolved after series scan completes

- Add 'system_progress' event type to loading page redirect condition
- Add checkUnresolvedAndRedirect() for phase=initial to handle race condition
  where backend initialization completes before WebSocket connects
- Backend now emits series_sync progress events during initial setup
- Loading page checks /api/setup/unresolved immediately on load for phase=initial
- Fixes users getting stuck on loading page after setup

src/server/web/templates/loading.html

@@ -451,8 +451,9 @@
             updateStep(stepId, status, msg, percent, current, total);
 
             // Check for completion of series_sync
-            // stepId is used because type is 'system_progress' for SYSTEM progress events
-            if (metadata?.initialization_complete || (stepId === 'series_sync' && status === 'completed')) {
+            // For scan_completed messages: stepId='scan_completed', no status field, no metadata
+            // system_progress events are emitted by progress_service during initial setup (ProgressType.SYSTEM)
+            if (metadata?.initialization_complete || type === 'scan_completed' || type === 'system_progress' || (stepId === 'series_sync' && status === 'completed')) {
                 // For initial phase, series_sync completion leads to /setup/unresolved
                 handleSeriesSyncComplete();
             }
@@ -720,10 +721,42 @@
                 createStep('nfo_scan', stepTitles['nfo_scan']);
                 // Trigger NFO scan phase via API
                 triggerNfoScanPhase();
+                connectWebSocket();
+            } else {
+                // For initial phase, initialization already completed before this page loaded
+                // Check for unresolved folders immediately and redirect
+                checkUnresolvedAndRedirect();
             }
-            
-            connectWebSocket();
         });
+
+        // For initial phase, check if there are unresolved folders and redirect accordingly
+        // This is needed because the backend initialization completes before this page loads,
+        // so WebSocket events are missed
+        async function checkUnresolvedAndRedirect() {
+            try {
+                const response = await fetch('/api/setup/unresolved');
+                if (response.ok) {
+                    const folders = await response.json();
+                    if (folders.length > 0) {
+                        // Unresolved folders exist - redirect to unresolved page
+                        clearSetupPhase();
+                        window.location.href = '/setup/unresolved';
+                    } else {
+                        // No unresolved folders - redirect to login
+                        clearSetupPhase();
+                        window.location.href = '/login';
+                    }
+                } else {
+                    // Error - stay on page and wait for potential WebSocket events
+                    console.error('Failed to check unresolved folders:', response.status);
+                    connectWebSocket();
+                }
+            } catch (error) {
+                console.error('Error checking unresolved folders:', error);
+                // Stay on page and wait for WebSocket events
+                connectWebSocket();
+            }
+        }
     </script>
 </body>