feat(web): consolidate task attempts in History mode (#1348)

web/src/__tests__/agent-run-timeline-mantine.test.tsx

@@ -506,7 +506,11 @@ describe('agent run timeline Mantine surface', () => {
       />
     );
 
-    expect(screen.getByText('Run Timeline')).toBeDefined();
+    expect(screen.getByText('Attempt Timeline')).toBeDefined();
+    expect(screen.getByText('Latest attempt')).toBeDefined();
+    expect(screen.getByRole('combobox', { name: 'Attempt' }).getAttribute('value')).toBe(
+      'Latest | attempt-1 | complete'
+    );
     expect(screen.getByText('Stored replay')).toBeDefined();
     expect(screen.getByText('command.completed')).toBeDefined();
     expect(screen.getByText('stream.stdout')).toBeDefined();
@@ -538,6 +542,29 @@ describe('agent run timeline Mantine surface', () => {
     expect(mocks.onOpenTab).toHaveBeenCalledWith('work-products');
   });
 
+  it('distinguishes an earlier attempt from the latest task execution', () => {
+    const taskWithHistory = createMockTask({
+      ...task,
+      attempt: {
+        id: 'attempt-current',
+        agent: 'veritas',
+        status: 'running',
+        started: '2026-06-01T11:00:00.000Z',
+      },
+      attempts: task.attempt ? [task.attempt] : [],
+    });
+
+    renderWithProviders(
+      <AgentRunTimelinePanel task={taskWithHistory} initialAttemptId="attempt-1" />
+    );
+
+    expect(screen.getByText('Historical attempt')).toBeDefined();
+    expect(screen.getByRole('combobox', { name: 'Attempt' }).getAttribute('value')).toBe(
+      'Historical | attempt-1 | completed'
+    );
+    expect(screen.queryByText(/live polling/)).toBeNull();
+  });
+
   it('highlights a deep-linked telemetry event', () => {
     renderWithProviders(
       <AgentRunTimelinePanel

web/src/__tests__/task-detail-mantine.test.tsx

@@ -116,7 +116,19 @@ vi.mock('@/components/task/AgentPanel', () => ({
 }));
 
 vi.mock('@/components/task/AgentRunTimelinePanel', () => ({
-  AgentRunTimelinePanel: () => <div>Run timeline panel</div>,
+  AgentRunTimelinePanel: ({
+    initialAttemptId,
+    initialEventId,
+  }: {
+    initialAttemptId?: string | null;
+    initialEventId?: string | null;
+  }) => (
+    <div>
+      Run timeline panel
+      <span>Attempt target: {initialAttemptId ?? 'none'}</span>
+      <span>Event target: {initialEventId ?? 'none'}</span>
+    </div>
+  ),
 }));
 
 vi.mock('@/components/task/DiffViewer', () => ({
@@ -537,7 +549,11 @@ describe('task detail Mantine migration', () => {
         task={codeTask}
         open
         onOpenChange={mocks.onOpenChange}
-        navigationTarget={{ tab: 'timeline', timelineAttemptId: 'attempt-1' }}
+        navigationTarget={{
+          tab: 'timeline',
+          timelineAttemptId: 'attempt-1',
+          timelineEventId: 'event-1',
+        }}
       />
     );
 
@@ -549,6 +565,8 @@ describe('task detail Mantine migration', () => {
     expect(screen.getByRole('tab', { name: 'Timeline' }).getAttribute('aria-selected')).toBe(
       'true'
     );
+    expect(screen.getByText('Attempt target: attempt-1')).toBeDefined();
+    expect(screen.getByText('Event target: event-1')).toBeDefined();
 
     rerender(
       <TaskDetailPanel

web/src/components/task/AgentRunTimelinePanel.tsx

@@ -899,12 +899,17 @@ function getRunOptions(
     attempts.set(id, label);
   };
 
+  const latestAttemptLabel =
+    task.attempt?.status === 'running' || task.attempt?.status === 'pending' ? 'Current' : 'Latest';
+  addAttempt(
+    task.attempt?.id,
+    `${latestAttemptLabel} | ${task.attempt?.id} | ${task.attempt?.status ?? 'unknown'}`
+  );
   for (const trace of traces) {
-    addAttempt(trace.traceId, `${trace.traceId} (${trace.status})`);
+    addAttempt(trace.traceId, `Historical | ${trace.traceId} | ${trace.status}`);
   }
-  addAttempt(task.attempt?.id, `${task.attempt?.id} (${task.attempt?.status ?? 'current'})`);
   for (const attempt of task.attempts ?? []) {
-    addAttempt(attempt.id, `${attempt.id} (${attempt.status})`);
+    addAttempt(attempt.id, `Historical | ${attempt.id} | ${attempt.status}`);
   }
   for (const event of telemetryEvents) {
     addAttempt(getEventAttemptId(event), `${getEventAttemptId(event)} (telemetry)`);
@@ -1222,6 +1227,17 @@ export function AgentRunTimelinePanel({
     (product) => !selectedAttemptId || product.sourceRunId === selectedAttemptId
   );
   const pendingTaskApprovals = approvals.filter((approval) => approval.taskId === task.id);
+  const selectedIsLatestAttempt = Boolean(
+    selectedAttemptId && selectedAttemptId === task.attempt?.id
+  );
+  const selectedIsLiveAttempt = hasLiveAttempt && selectedIsLatestAttempt;
+  const selectedAttemptScope = selectedIsLiveAttempt
+    ? 'Current attempt'
+    : selectedIsLatestAttempt
+      ? 'Latest attempt'
+      : selectedAttemptId
+        ? 'Historical attempt'
+        : 'Derived history';
 
   useEffect(() => {
     setVisibleCount(TIMELINE_PAGE_SIZE);
@@ -1436,7 +1452,8 @@ export function AgentRunTimelinePanel({
                 <ThemeIcon size="sm" radius="xl" variant="light">
                   <History className="h-4 w-4" />
                 </ThemeIcon>
-                <Text fw={700}>Run Timeline</Text>
+                <Text fw={700}>Attempt Timeline</Text>
+                <Badge variant="outline">{selectedAttemptScope}</Badge>
                 <Badge color={SOURCE_COLORS[source]} variant="light">
                   {source === 'live' ? 'Live' : source === 'stored' ? 'Stored replay' : 'Derived'}
                 </Badge>
@@ -1451,7 +1468,7 @@ export function AgentRunTimelinePanel({
               </Group>
               <Text size="sm" c="dimmed" mt={6}>
                 {selectedAttemptId || 'No attempt selected'} | {events.length} events
-                {hasLiveAttempt ? ' | live polling' : ''}
+                {selectedIsLiveAttempt ? ' | live polling' : ''}
               </Text>
             </div>
             {isLoading && (
@@ -1466,8 +1483,8 @@ export function AgentRunTimelinePanel({
 
           <SimpleGrid cols={{ base: 1, sm: 2 }} spacing="sm">
             <Select
-              label="Run"
-              aria-label="Run"
+              label="Attempt"
+              aria-label="Attempt"
               value={selectedAttemptId}
               onChange={setSelectedAttemptId}
               data={runOptions}

web/src/lib/__tests__/task-detail-workspace.test.ts

@@ -83,6 +83,15 @@ describe('task workspace navigation', () => {
         resolveTaskDetailNavigationTab({ workspace: { version: 1, mode: 'run', section } }, tabs)
       ).toBe(section);
     }
+    for (const section of ['timeline', 'metrics'] as const) {
+      expect(resolveTaskDetailNavigationTab({ tab: section }, tabs)).toBe(section);
+      expect(
+        resolveTaskDetailNavigationTab(
+          { workspace: { version: 1, mode: 'history', section } },
+          tabs
+        )
+      ).toBe(section);
+    }
     const tabsWithWorktree = getAvailableTaskDetailTabMetadata({
       isCodeTask: true,
       hasWorktree: true,