Add connected technician tracking to dashboard

- Add ViewerInfo struct to track viewer name and connection time
- Update session manager to track viewers with names
- Update API to return viewer list for each session
- Update dashboard to display "Mike Connected (3 min)" on machine bars
- Update viewer.html to pass viewer_name parameter

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

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

server/static/dashboard.html

@@ -673,6 +673,39 @@
             }
         }
 
+        // Format duration since connection
+        function formatDuration(connectedAt) {
+            const now = new Date();
+            const connected = new Date(connectedAt);
+            const diffMs = now - connected;
+            const diffMins = Math.floor(diffMs / 60000);
+            const diffHours = Math.floor(diffMins / 60);
+
+            if (diffMins < 1) return 'just now';
+            if (diffMins < 60) return diffMins + ' min';
+            if (diffHours < 24) return diffHours + ' hr';
+            return Math.floor(diffHours / 24) + ' day';
+        }
+
+        // Format connected technicians display
+        function formatViewers(viewers) {
+            if (!viewers || viewers.length === 0) return '';
+
+            // Get names (filter out default "Technician" if there's a real name)
+            const names = viewers.map(v => v.name || 'Technician');
+
+            // Find earliest connection for duration
+            const earliest = viewers.reduce((min, v) => {
+                const t = new Date(v.connected_at);
+                return t < min ? t : min;
+            }, new Date(viewers[0].connected_at));
+
+            const duration = formatDuration(earliest);
+            const nameList = names.join(', ');
+
+            return nameList + ' Connected (' + duration + ')';
+        }
+
         function renderMachinesList() {
             const container = document.getElementById("machinesList");
 
@@ -697,13 +730,19 @@
                 const isSelected = selectedMachine?.id === m.id;
                 const statusColor = m.is_online ? 'hsl(142, 76%, 50%)' : 'hsl(0, 0%, 50%)';
                 const statusText = m.is_online ? 'Online' : 'Offline';
+                const viewersText = formatViewers(m.viewers);
+                const viewersHtml = viewersText
+                    ? '<div style="font-size: 11px; color: hsl(142, 76%, 50%); margin-left: auto; white-space: nowrap;">' + escapeHtml(viewersText) + '</div>'
+                    : '';
+
                 return '<div class="sidebar-item' + (isSelected ? ' active' : '') + '" onclick="selectMachine(\'' + m.id + '\')" style="margin-bottom: 8px; padding: 12px;">' +
-                    '<div style="display: flex; align-items: center; gap: 12px;">' +
-                        '<div style="width: 10px; height: 10px; border-radius: 50%; background: ' + statusColor + ';"></div>' +
-                        '<div>' +
+                    '<div style="display: flex; align-items: center; gap: 12px; width: 100%;">' +
+                        '<div style="width: 10px; height: 10px; border-radius: 50%; background: ' + statusColor + '; flex-shrink: 0;"></div>' +
+                        '<div style="flex: 1; min-width: 0;">' +
                             '<div style="font-weight: 500;">' + (m.agent_name || m.agent_id.slice(0,8)) + '</div>' +
                             '<div style="font-size: 12px; color: hsl(var(--muted-foreground));">' + statusText + ' • ' + started + '</div>' +
                         '</div>' +
+                        viewersHtml +
                     '</div>' +
                 '</div>';
             }).join("") + '</div>';
@@ -836,7 +875,8 @@
             }
 
             const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
-            const wsUrl = `${protocol}//${window.location.host}/ws/viewer?session_id=${sessionId}`;
+            const viewerName = user?.name || user?.email || "Technician";
+            const wsUrl = `${protocol}//${window.location.host}/ws/viewer?session_id=${sessionId}&viewer_name=${encodeURIComponent(viewerName)}`;
 
             console.log("Connecting chat to:", wsUrl);
             chatSocket = new WebSocket(wsUrl);