Improve FG scan page UX and integrate scan-to-boxes with QZ Tray printing

- Redesigned scan card layout: 500px width with horizontal label-input layout
- Reduced spacing and optimized for no scrolling (700px max-height)
- Added auto-advance between fields when valid data is entered
- Integrated scan-to-boxes popup with warehouse box assignment
- Added QZ Tray printing to Quick Box Creation button
- Box labels now print automatically after creation in scan workflow
- Fixed warehouse blueprint URL prefix registration (/warehouse)
- Updated manage_boxes to return JSON for AJAX requests
- Improved error message grid layout to maintain form alignment

py_app/app/templates/fg_scan.html

@@ -3,12 +3,15 @@
 {% block title %}Finish Good Scan{% endblock %}
 {% block head %}
 <link rel="stylesheet" href="{{ url_for('static', filename='css/scan.css') }}">
+<!-- QZ Tray for printing -->
+<script src="https://cdn.jsdelivr.net/npm/qz-tray@2.2.0/qz-tray.min.js"></script>
 <style>
     .error-message {
         color: #ff4444;
         font-size: 0.9em;
         margin-top: 5px;
         display: none;
+        grid-column: 2 / -1;
     }
     .error-message.show {
         display: block;
@@ -275,6 +278,11 @@ document.addEventListener('DOMContentLoaded', function() {
         } else {
             operatorErrorMessage.classList.remove('show');
             this.setCustomValidity('');
+            
+            // Auto-advance when field is complete and valid
+            if (value.length === 4 && value.startsWith('OP')) {
+                cpCodeInput.focus();
+            }
         }
     });
     
@@ -312,6 +320,11 @@ document.addEventListener('DOMContentLoaded', function() {
         } else {
             cpErrorMessage.classList.remove('show');
             this.setCustomValidity('');
+            
+            // Auto-advance when field is complete and valid
+            if (value.length === 15 && value.startsWith('CP')) {
+                oc1CodeInput.focus();
+            }
         }
     });
     
@@ -369,6 +382,11 @@ document.addEventListener('DOMContentLoaded', function() {
         } else {
             oc1ErrorMessage.classList.remove('show');
             this.setCustomValidity('');
+            
+            // Auto-advance when field is complete and valid
+            if (value.length === 4 && value.startsWith('OC')) {
+                oc2CodeInput.focus();
+            }
         }
     });
     
@@ -423,6 +441,11 @@ document.addEventListener('DOMContentLoaded', function() {
         } else {
             oc2ErrorMessage.classList.remove('show');
             this.setCustomValidity('');
+            
+            // Auto-advance when field is complete and valid
+            if (value.length === 4 && value.startsWith('OC')) {
+                defectCodeInput.focus();
+            }
         }
     });
     
@@ -550,6 +573,12 @@ document.addEventListener('DOMContentLoaded', function() {
             localStorage.setItem('fg_scan_last_defect', defectCodeInput.value);
             
             // Check if scan-to-boxes is enabled and defect code is 000
+            console.log('Auto-submit check:', {
+                scanToBoxesEnabled: scanToBoxesEnabled,
+                defectCode: this.value,
+                shouldShowModal: scanToBoxesEnabled && this.value === '000'
+            });
+            
             if (scanToBoxesEnabled && this.value === '000') {
                 console.log('Auto-submit: Scan-to-boxes enabled, calling submitScanWithBoxAssignment');
                 submitScanWithBoxAssignment();
@@ -647,6 +676,15 @@ document.addEventListener('DOMContentLoaded', function() {
             alert('✅ Saved Quality Operator code cleared! Please re-enter your operator code.');
         }
     });
+    
+    // Initialize QZ Tray for printing box labels
+    if (window.qz) {
+        window.qz.websocket.connect().then(() => {
+            console.log('QZ Tray connected for box label printing');
+        }).catch(err => {
+            console.warn('QZ Tray not available:', err);
+        });
+    }
 });
 </script>
 
@@ -656,6 +694,10 @@ document.addEventListener('DOMContentLoaded', function() {
     // Quick box creation button
     document.getElementById('quick-box-create-btn').addEventListener('click', async function() {
         try {
+            this.disabled = true;
+            this.textContent = 'Creating...';
+            
+            // Step 1: Create box in database
             const createResponse = await fetch('/warehouse/manage_boxes', {
                 method: 'POST',
                 headers: { 
@@ -670,14 +712,56 @@ document.addEventListener('DOMContentLoaded', function() {
             const result = await createResponse.json();
             
             if (result.success && result.box_number) {
-                await assignCpToBox(result.box_number);
-                showNotification(`✅ Box ${result.box_number} created and CP assigned!`, 'success');
-                closeBoxModal();
+                const boxNumber = result.box_number;
+                
+                // Step 2: Print the box label using QZ Tray
+                try {
+                    // Check QZ Tray connection
+                    if (!window.qz || !window.qz.websocket.isActive()) {
+                        throw new Error('QZ Tray not connected. Please ensure QZ Tray is running.');
+                    }
+                    
+                    // Get available printers
+                    const printers = await window.qz.printers.find();
+                    if (printers.length === 0) {
+                        throw new Error('No printers found');
+                    }
+                    
+                    // Use first available printer
+                    const printer = printers[0];
+                    
+                    // Create ZPL code for box label
+                    const zpl = `^XA
+^FO50,50^A0N,40,40^FDBox: ${boxNumber}^FS
+^FO50,120^BY2,3,80^BCN,80,Y,N,N^FD${boxNumber}^FS
+^XZ`;
+                    
+                    const config = window.qz.configs.create(printer);
+                    await window.qz.print(config, [zpl]);
+                    
+                    showNotification(`✅ Box ${boxNumber} created and label printed!`, 'success');
+                    
+                    // Step 3: Keep modal open and focus on scan input
+                    document.getElementById('scan-box-input').value = '';
+                    document.getElementById('scan-box-input').focus();
+                    document.getElementById('scan-box-input').placeholder = 'Scan the printed label now...';
+                    
+                } catch (printError) {
+                    console.error('Print error:', printError);
+                    showNotification(`⚠️ Box ${boxNumber} created but print failed: ${printError.message}`, 'warning');
+                    // Still keep modal open for manual entry
+                    document.getElementById('scan-box-input').focus();
+                }
+                
             } else {
                 throw new Error(result.error || 'Failed to create box');
             }
         } catch (error) {
             showNotification('❌ Error creating box: ' + error.message, 'error');
+        } finally {
+            // Re-enable button
+            this.disabled = false;
+            this.textContent = 'Quick Box Label Creation';
         }
     });