feat(US-1305): Add status history to activity sidebar

- Added daily summary card showing active/idle time and utilization %
- Added Status History tab with today's status transitions
- Display previous/new status with duration of each state
- Mini progress bar for visual time breakdown
- Backend was already complete (status-history-service logs all status changes)

.veritas-kanban/telemetry/events-2026-01-28.ndjson

@@ -1107,3 +1107,4 @@
 {"type":"task.created","taskId":"task_20260128_b2CW4g","project":"project-a","status":"todo","id":"evt_-g7kMhjBnCYG","timestamp":"2026-01-28T14:13:49.936Z"}
 {"type":"task.created","taskId":"task_20260128_NEm1K_","project":"project-b","status":"todo","id":"evt_aCXwbrsfHVkW","timestamp":"2026-01-28T14:13:49.937Z"}
 {"type":"task.created","taskId":"task_20260128_eCyXeF","status":"todo","id":"evt_qx8JflCKJ_1V","timestamp":"2026-01-28T14:13:49.944Z"}
+{"type":"task.status_changed","taskId":"task_20260128_d47DtQ","project":"platform","status":"blocked","previousStatus":"todo","id":"evt_dcyHNA6aIlp5","timestamp":"2026-01-28T14:13:59.205Z"}

server/.veritas-kanban/activity.json

@@ -1,4 +1,33 @@
 [
+  {
+    "id": "activity_1769609642656_9lea2p5ac",
+    "type": "comment_added",
+    "taskId": "task_20260128_V0MVwS",
+    "taskTitle": "US-1405: Dashboard metrics cards refresh",
+    "details": {
+      "author": "Veritas",
+      "preview": "Verified dashboard metrics cards are fully functio..."
+    },
+    "timestamp": "2026-01-28T14:14:02.656Z"
+  },
+  {
+    "id": "activity_1769609642614_cy9x653r2",
+    "type": "task_updated",
+    "taskId": "task_20260128_V0MVwS",
+    "taskTitle": "US-1405: Dashboard metrics cards refresh",
+    "timestamp": "2026-01-28T14:14:02.614Z"
+  },
+  {
+    "id": "activity_1769609639205_sn6jggief",
+    "type": "status_changed",
+    "taskId": "task_20260128_d47DtQ",
+    "taskTitle": "FEATURE REQUEST: Host Kimi K2.5 Model In Azure",
+    "details": {
+      "from": "todo",
+      "status": "blocked"
+    },
+    "timestamp": "2026-01-28T14:13:59.205Z"
+  },
   {
     "id": "activity_1769609585007_vp6ouz8mc",
     "type": "comment_added",

web/src/components/layout/ActivitySidebar.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react';
-import { Activity, Trash2, RefreshCw, Clock, Coffee, ArrowRight, Zap } from 'lucide-react';
+import { Activity, Trash2, RefreshCw, Coffee, ArrowRight, Zap } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { ScrollArea } from '@/components/ui/scroll-area';
 import {
@@ -102,8 +102,147 @@ function ActivityRow({ activity }: { activity: ActivityItem }) {
   );
 }
 
+// Status Badge component
+function StatusBadge({ status }: { status: string }) {
+  const colorClass = getStatusColor(status);
+  
+  return (
+    <span className={cn(
+      'inline-flex items-center px-2 py-0.5 rounded text-xs font-medium text-white',
+      colorClass
+    )}>
+      {status}
+    </span>
+  );
+}
+
+// Daily Summary Card
+function DailySummaryCard() {
+  const { data: summary, isLoading } = useDailySummary();
+  
+  if (isLoading || !summary) {
+    return (
+      <div className="px-4 py-3 border-b bg-muted/30">
+        <div className="animate-pulse flex items-center gap-4">
+          <div className="h-10 w-20 bg-muted rounded"></div>
+          <div className="h-10 w-20 bg-muted rounded"></div>
+          <div className="h-10 w-20 bg-muted rounded"></div>
+        </div>
+      </div>
+    );
+  }
+  
+  const total = summary.activeMs + summary.idleMs + summary.errorMs;
+  const activePercent = total > 0 ? Math.round((summary.activeMs / total) * 100) : 0;
+  
+  return (
+    <div className="px-4 py-3 border-b bg-muted/30">
+      <div className="text-xs font-medium text-muted-foreground mb-2">Today's Summary</div>
+      <div className="flex items-center gap-3">
+        <div className="flex items-center gap-1.5">
+          <Zap className="h-4 w-4 text-green-500" />
+          <div>
+            <div className="text-sm font-bold text-green-500">{formatDurationMs(summary.activeMs)}</div>
+            <div className="text-xs text-muted-foreground">Active</div>
+          </div>
+        </div>
+        <div className="flex items-center gap-1.5">
+          <Coffee className="h-4 w-4 text-muted-foreground" />
+          <div>
+            <div className="text-sm font-bold text-muted-foreground">{formatDurationMs(summary.idleMs)}</div>
+            <div className="text-xs text-muted-foreground">Idle</div>
+          </div>
+        </div>
+        <div className="flex items-center gap-1.5 ml-auto">
+          <div className="text-right">
+            <div className="text-sm font-bold">{activePercent}%</div>
+            <div className="text-xs text-muted-foreground">Utilization</div>
+          </div>
+        </div>
+      </div>
+      {/* Mini progress bar */}
+      {total > 0 && (
+        <div className="mt-2 h-1.5 rounded-full overflow-hidden flex bg-muted">
+          <div 
+            className="bg-green-500 transition-all"
+            style={{ width: `${(summary.activeMs / total) * 100}%` }}
+          />
+          <div 
+            className="bg-gray-400 transition-all"
+            style={{ width: `${(summary.idleMs / total) * 100}%` }}
+          />
+          {summary.errorMs > 0 && (
+            <div 
+              className="bg-red-500 transition-all"
+              style={{ width: `${(summary.errorMs / total) * 100}%` }}
+            />
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+// Status Transition Row
+function StatusTransitionRow({ entry }: { entry: StatusHistoryEntry }) {
+  return (
+    <div className="flex items-center gap-2 py-3 px-2 hover:bg-muted/50 rounded-md transition-colors">
+      <span className="text-xs text-muted-foreground w-14 shrink-0">
+        {new Date(entry.timestamp).toLocaleTimeString([], { 
+          hour: '2-digit', 
+          minute: '2-digit' 
+        })}
+      </span>
+      <StatusBadge status={entry.previousStatus} />
+      <ArrowRight className="h-3 w-3 text-muted-foreground shrink-0" />
+      <StatusBadge status={entry.newStatus} />
+      {entry.durationMs && (
+        <span className="text-xs text-muted-foreground ml-auto">
+          {formatDurationMs(entry.durationMs)}
+        </span>
+      )}
+    </div>
+  );
+}
+
+// Status History List
+function StatusHistoryList() {
+  const { data: history, isLoading } = useStatusHistory(50);
+  
+  // Filter to today's entries
+  const today = new Date().toISOString().split('T')[0];
+  const todayEntries = history?.filter(entry => 
+    entry.timestamp.startsWith(today)
+  ) || [];
+  
+  if (isLoading) {
+    return (
+      <div className="text-center text-muted-foreground py-8">
+        Loading status history...
+      </div>
+    );
+  }
+  
+  if (todayEntries.length === 0) {
+    return (
+      <div className="text-center text-muted-foreground py-8">
+        No status changes today
+      </div>
+    );
+  }
+  
+  return (
+    <div className="divide-y divide-border">
+      {todayEntries.map(entry => (
+        <StatusTransitionRow key={entry.id} entry={entry} />
+      ))}
+    </div>
+  );
+}
+
 export function ActivitySidebar({ open, onOpenChange }: ActivitySidebarProps) {
   const [filter, setFilter] = useState<string>('all');
+  const [tab, setTab] = useState<string>('tasks');
   const { data: activities, isLoading, refetch, isRefetching } = useActivities(100);
   const clearActivities = useClearActivities();
 
@@ -146,43 +285,64 @@ export function ActivitySidebar({ open, onOpenChange }: ActivitySidebarProps) {
               </Button>
             </div>
           </div>
-          
-          {activityTypes.length > 1 && (
-            <Select value={filter} onValueChange={setFilter}>
-              <SelectTrigger className="mt-2">
-                <SelectValue placeholder="Filter activities" />
-              </SelectTrigger>
-              <SelectContent>
-                <SelectItem value="all">All Activities</SelectItem>
-                {activityTypes.map(type => (
-                  <SelectItem key={type} value={type}>
-                    {activityIcons[type]} {activityLabels[type]}
-                  </SelectItem>
-                ))}
-              </SelectContent>
-            </Select>
-          )}
         </SheetHeader>
 
-        <ScrollArea className="h-[calc(100vh-120px)]">
-          <div className="px-2 py-2">
-            {isLoading ? (
-              <div className="text-center text-muted-foreground py-8">
-                Loading activities...
-              </div>
-            ) : filteredActivities.length === 0 ? (
-              <div className="text-center text-muted-foreground py-8">
-                No activities yet
-              </div>
-            ) : (
-              <div className="divide-y divide-border">
-                {filteredActivities.map(activity => (
-                  <ActivityRow key={activity.id} activity={activity} />
-                ))}
+        {/* Daily Summary always visible at top */}
+        <DailySummaryCard />
+
+        <Tabs value={tab} onValueChange={setTab} className="flex flex-col h-[calc(100vh-200px)]">
+          <TabsList className="mx-4 mt-2 grid w-[calc(100%-32px)] grid-cols-2">
+            <TabsTrigger value="tasks">Task Activity</TabsTrigger>
+            <TabsTrigger value="status">Status History</TabsTrigger>
+          </TabsList>
+          
+          <TabsContent value="tasks" className="flex-1 mt-0">
+            {activityTypes.length > 1 && (
+              <div className="px-4 py-2">
+                <Select value={filter} onValueChange={setFilter}>
+                  <SelectTrigger>
+                    <SelectValue placeholder="Filter activities" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value="all">All Activities</SelectItem>
+                    {activityTypes.map(type => (
+                      <SelectItem key={type} value={type}>
+                        {activityIcons[type]} {activityLabels[type]}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
               </div>
             )}
-          </div>
-        </ScrollArea>
+            <ScrollArea className="h-full">
+              <div className="px-2 py-2">
+                {isLoading ? (
+                  <div className="text-center text-muted-foreground py-8">
+                    Loading activities...
+                  </div>
+                ) : filteredActivities.length === 0 ? (
+                  <div className="text-center text-muted-foreground py-8">
+                    No activities yet
+                  </div>
+                ) : (
+                  <div className="divide-y divide-border">
+                    {filteredActivities.map(activity => (
+                      <ActivityRow key={activity.id} activity={activity} />
+                    ))}
+                  </div>
+                )}
+              </div>
+            </ScrollArea>
+          </TabsContent>
+          
+          <TabsContent value="status" className="flex-1 mt-0">
+            <ScrollArea className="h-full">
+              <div className="px-2 py-2">
+                <StatusHistoryList />
+              </div>
+            </ScrollArea>
+          </TabsContent>
+        </Tabs>
       </SheetContent>
     </Sheet>
   );