Implement agent queue transfer functionality for browser phones

- Added ajax_get_transfer_agents endpoint to retrieve available agents
- Enhanced transfer system to support both phone numbers and personal queues
- Updated JavaScript transfer dialog to show agent selection with queue options
- Added personal queue database table creation for agent-to-agent transfers
- Implemented transfer-to-queue functionality using Twilio enqueue
- Added comprehensive CSS styling for new agent transfer dialog
- Each agent gets a personal queue (format: agent_{id}) for browser phone transfers
- Supports both phone transfers and browser phone queue transfers
- Enhanced UI shows transfer method options (phone vs browser phone queue)

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

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

assets/css/browser-phone-frontend.css

@@ -1138,4 +1138,119 @@
 @keyframes spin {
     0% { transform: rotate(0deg); }
     100% { transform: rotate(360deg); }
+}
+
+/* Agent Transfer Dialog Styles */
+.twp-agent-transfer-dialog {
+    max-width: 500px;
+    width: 90vw;
+}
+
+.agent-list {
+    max-height: 300px;
+    overflow-y: auto;
+    margin: 15px 0;
+    border: 1px solid #ddd;
+    border-radius: 6px;
+    background: #f9f9f9;
+}
+
+.agent-option {
+    padding: 12px;
+    border-bottom: 1px solid #eee;
+    background: white;
+    margin-bottom: 1px;
+}
+
+.agent-option:last-child {
+    border-bottom: none;
+}
+
+.agent-option.offline {
+    opacity: 0.6;
+    background: #f5f5f5;
+}
+
+.agent-info {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 8px;
+}
+
+.agent-name {
+    font-weight: 600;
+    font-size: 0.95rem;
+}
+
+.agent-status {
+    font-size: 0.85rem;
+    font-weight: 500;
+}
+
+.transfer-methods {
+    display: flex;
+    gap: 8px;
+    flex-wrap: wrap;
+}
+
+.transfer-option {
+    background: #e9ecef;
+    border: 2px solid #e9ecef;
+    padding: 6px 12px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 0.85rem;
+    transition: all 0.2s ease;
+    user-select: none;
+}
+
+.transfer-option:hover {
+    background: #dee2e6;
+    border-color: #adb5bd;
+}
+
+.transfer-option.selected {
+    background: #e3f2fd;
+    border-color: #2196f3;
+    color: #1976d2;
+}
+
+.transfer-option:active {
+    transform: scale(0.98);
+}
+
+.agent-option.offline .transfer-option {
+    opacity: 0.5;
+    cursor: not-allowed;
+}
+
+.agent-option.offline .transfer-option:hover {
+    background: #e9ecef;
+    border-color: #e9ecef;
+}
+
+.manual-option {
+    margin-top: 20px;
+    padding-top: 15px;
+    border-top: 1px solid #ddd;
+}
+
+.manual-option h4 {
+    margin: 0 0 8px 0;
+    font-size: 1rem;
+    color: #495057;
+}
+
+.manual-option p {
+    margin: 0 0 10px 0;
+    font-size: 0.9rem;
+    color: #6c757d;
+}
+
+.no-agents {
+    text-align: center;
+    padding: 20px;
+    color: #6c757d;
+    font-style: italic;
 }

assets/js/browser-phone-frontend.js

@@ -1577,21 +1577,40 @@
     }
     
     /**
-     * Transfer call to another agent
+     * Transfer call to phone number (legacy function)
      */
     function transferCall(agentNumber) {
+        transferToTarget('phone', agentNumber);
+    }
+    
+    /**
+     * Transfer call to target (phone or queue)
+     */
+    function transferToTarget(transferType, transferTarget) {
         if (!currentCall || currentCall.status() !== 'open') {
             showMessage('No active call to transfer', 'error');
             return;
         }
         
+        // Get Call SID using multiple detection methods
+        const callSid = currentCall.parameters.CallSid || 
+                        currentCall.customParameters.CallSid || 
+                        currentCall.outgoingConnectionId ||
+                        currentCall.sid;
+                        
+        if (!callSid) {
+            showMessage('Unable to identify call for transfer', 'error');
+            return;
+        }
+        
         $.ajax({
             url: twp_frontend_ajax.ajax_url,
             method: 'POST',
             data: {
                 action: 'twp_transfer_call',
-                call_sid: currentCall.parameters.CallSid,
-                agent_number: agentNumber,
+                call_sid: callSid,
+                transfer_type: transferType,
+                transfer_target: transferTarget,
                 nonce: twp_frontend_ajax.nonce
             },
             success: function(response) {
@@ -1777,26 +1796,77 @@
     /**
      * Show agent selection transfer dialog
      */
-    function showAgentTransferDialog(agents) {
+    function showAgentTransferDialog() {
+        // Load available agents for transfer
+        $.ajax({
+            url: twp_frontend_ajax.ajax_url,
+            method: 'POST',
+            data: {
+                action: 'twp_get_transfer_agents',
+                nonce: twp_frontend_ajax.nonce
+            },
+            success: function(response) {
+                if (response.success) {
+                    buildAgentTransferDialog(response.data);
+                } else {
+                    showMessage('Failed to load agents: ' + (response.data || 'Unknown error'), 'error');
+                    showManualTransferDialog(); // Fallback to manual entry
+                }
+            },
+            error: function() {
+                showMessage('Failed to load agents', 'error');
+                showManualTransferDialog(); // Fallback to manual entry
+            }
+        });
+    }
+    
+    /**
+     * Build and display agent transfer dialog with loaded agents
+     */
+    function buildAgentTransferDialog(agents) {
         let agentOptions = '<div class="agent-list">';
         
-        agents.forEach(function(agent) {
-            const statusClass = agent.is_available ? 'available' : (agent.status === 'busy' ? 'busy' : 'offline');
-            const statusText = agent.is_available ? '🟢 Available' : (agent.status === 'busy' ? '🔴 Busy' : '⚫ Offline');
-            const methodIcon = agent.has_phone ? '📱' : '💻';
-            
-            agentOptions += `
-                <div class="agent-option ${statusClass}" data-agent-id="${agent.id}" 
-                     data-transfer-method="${agent.transfer_method}" 
-                     data-transfer-value="${agent.transfer_value}">
-                    <div class="agent-info">
-                        <span class="agent-name">${agent.name}</span>
-                        <span class="agent-method">${methodIcon}</span>
+        if (agents.length === 0) {
+            agentOptions += '<p class="no-agents">No other agents available for transfer</p>';
+        } else {
+            agents.forEach(function(agent) {
+                const statusClass = agent.status === 'available' ? 'available' : 
+                                  agent.status === 'busy' ? 'busy' : 'offline';
+                const statusText = agent.status === 'available' ? '🟢 Available' : 
+                                 agent.status === 'busy' ? '🔴 Busy' : '⚫ Offline';
+                
+                // Determine transfer options
+                let transferOptions = '<div class="transfer-methods">';
+                
+                // Add browser phone queue option (always available)
+                transferOptions += `
+                    <div class="transfer-option" data-type="queue" data-target="${agent.queue_name}">
+                        💻 Browser Phone Queue
                     </div>
-                    <div class="agent-status">${statusText}</div>
-                </div>
-            `;
-        });
+                `;
+                
+                // Add phone option if available
+                if (agent.has_phone && agent.phone) {
+                    transferOptions += `
+                        <div class="transfer-option" data-type="phone" data-target="${agent.phone}">
+                            📱 Phone (${agent.phone})
+                        </div>
+                    `;
+                }
+                
+                transferOptions += '</div>';
+                
+                agentOptions += `
+                    <div class="agent-option ${statusClass}" data-agent-id="${agent.id}">
+                        <div class="agent-info">
+                            <span class="agent-name">${agent.name}</span>
+                            <span class="agent-status">${statusText}</span>
+                        </div>
+                        ${transferOptions}
+                    </div>
+                `;
+            });
+        }
         
         agentOptions += '</div>';
         
@@ -1804,10 +1874,11 @@
             <div id="twp-transfer-dialog" class="twp-dialog-overlay">
                 <div class="twp-dialog twp-agent-transfer-dialog">
                     <h3>Transfer Call to Agent</h3>
-                    <p>Select an agent to transfer this call to:</p>
+                    <p>Select an agent and transfer method:</p>
                     ${agentOptions}
                     <div class="manual-option">
-                        <p>Or enter a phone number manually:</p>
+                        <h4>Manual Transfer</h4>
+                        <p>Or enter a phone number directly:</p>
                         <input type="tel" id="twp-transfer-manual-number" placeholder="+1234567890" />
                     </div>
                     <div class="dialog-buttons">
@@ -1820,24 +1891,30 @@
         
         $('body').append(dialog);
         
-        // Handle agent selection
-        let selectedAgent = null;
-        $('.agent-option').on('click', function() {
-            if ($(this).hasClass('offline')) {
+        // Handle transfer option selection
+        let selectedTransfer = null;
+        $('.transfer-option').on('click', function() {
+            const agentOption = $(this).closest('.agent-option');
+            
+            // Check if agent is available
+            if (agentOption.hasClass('offline')) {
                 showMessage('Cannot transfer to offline agents', 'error');
                 return;
             }
             
-            $('.agent-option').removeClass('selected');
+            // Clear other selections
+            $('.transfer-option').removeClass('selected');
+            $('#twp-transfer-manual-number').val('');
+            
+            // Select this option
             $(this).addClass('selected');
             
-            selectedAgent = {
-                id: $(this).data('agent-id'),
-                method: $(this).data('transfer-method'),
-                value: $(this).data('transfer-value')
+            selectedTransfer = {
+                type: $(this).data('type'),
+                target: $(this).data('target'),
+                agentId: agentOption.data('agent-id')
             };
             
-            $('#twp-transfer-manual-number').val('');
             $('#twp-confirm-agent-transfer').prop('disabled', false);
         });
         
@@ -1845,24 +1922,18 @@
         $('#twp-transfer-manual-number').on('input', function() {
             const number = $(this).val().trim();
             if (number) {
-                $('.agent-option').removeClass('selected');
-                selectedAgent = null;
+                $('.transfer-option').removeClass('selected');
+                selectedTransfer = { type: 'phone', target: number };
                 $('#twp-confirm-agent-transfer').prop('disabled', false);
             } else {
-                $('#twp-confirm-agent-transfer').prop('disabled', !selectedAgent);
+                $('#twp-confirm-agent-transfer').prop('disabled', !selectedTransfer);
             }
         });
         
         // Handle transfer confirmation
         $('#twp-confirm-agent-transfer').on('click', function() {
-            const manualNumber = $('#twp-transfer-manual-number').val().trim();
-            
-            if (manualNumber) {
-                // Manual phone transfer
-                transferCall(manualNumber);
-            } else if (selectedAgent) {
-                // Agent transfer (phone or queue)
-                transferToAgent(selectedAgent);
+            if (selectedTransfer) {
+                transferToTarget(selectedTransfer.type, selectedTransfer.target);
             }
         });
     }
@@ -1887,43 +1958,6 @@
         $('body').append(dialog);
     }
     
-    /**
-     * Transfer call to selected agent
-     */
-    function transferToAgent(agent) {
-        if (!currentCall || currentCall.status() !== 'open') {
-            showMessage('No active call to transfer', 'error');
-            return;
-        }
-        
-        $.ajax({
-            url: twp_frontend_ajax.ajax_url,
-            method: 'POST',
-            data: {
-                action: 'twp_transfer_to_agent_queue',
-                call_sid: currentCall.parameters.CallSid,
-                agent_id: agent.id,
-                transfer_method: agent.method,
-                transfer_value: agent.value,
-                nonce: twp_frontend_ajax.nonce
-            },
-            success: function(response) {
-                if (response.success) {
-                    showMessage('Call transferred successfully', 'success');
-                    hideTransferDialog();
-                    // End the call on our end
-                    if (currentCall) {
-                        currentCall.disconnect();
-                    }
-                } else {
-                    showMessage('Failed to transfer call: ' + (response.data || 'Unknown error'), 'error');
-                }
-            },
-            error: function() {
-                showMessage('Failed to transfer call', 'error');
-            }
-        });
-    }
     
     /**
      * Hide transfer dialog