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fix(trajectory): preserve state across history prepends

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This commit is contained in:
_Kerman
2026-08-04 16:53:52 +08:00
parent 327505f5c6
commit 13fed3721f
23 changed files with 425 additions and 84 deletions
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packages/client/ui-trajectory/src/client/TrajectoryTable.tsx
+69 -45
View File
@@ -19,7 +19,7 @@ import type {
import type {
AssistantMetricDetail, TrajectoryCellKind, TrajectoryCellProps, TrajectorySourceBlock,
} from './trajectory-record.ts'
import { formatElapsedSeconds } from './trajectory-record.ts'
import { formatElapsedSeconds, trajectoryRecordId } from './trajectory-record.ts'
import { trajectoryPreviewText, type TrajectoryTurnModel } from './layout.ts'
import css from './TrajectoryTable.module.css'
@@ -27,6 +27,7 @@ const BOTTOM_FOLLOW_THRESHOLD_PX = 2
const OLDER_LOAD_THRESHOLD_PX = 48
const VIRTUALIZATION_THRESHOLD = 100
const VIRTUAL_ROW_HEIGHT_PX = 30
const COLLAPSED_SUMMARY_HEIGHT_PX = 20
const VIRTUAL_FINAL_REQUEST_HEIGHT_PX = 9
const VIRTUAL_OVERSCAN_ROWS = 12
const VIRTUAL_INITIAL_VIEWPORT_HEIGHT_PX = 600
@@ -157,9 +158,8 @@ interface ToolCallTextParts {
interface SelectedRequest {
turn: number | null
section: number
number: number
group: string
seq?: number
}
interface DetailsResizeDrag {
@@ -333,7 +333,7 @@ export interface TrajectoryTableProps {
recordFocus?: { readonly index: number } | null
/** Whether the initial history tail is still loading. */
historyLoading?: boolean
/** First loaded history node, used to preserve scroll position after prepending a page. */
/** First loaded raw event, used to preserve scroll position after prepending a page. */
historyStartSeq?: number | undefined
/** Whether one older history page can be requested. */
hasOlderRecords?: boolean
@@ -345,10 +345,10 @@ export interface TrajectoryTableProps {
collapsedTurns: ReadonlySet<number>
/** Toggle one turn between folded and expanded. */
onToggleTurn: (turn: number) => void
/** Assistant record indexes whose tool calls are folded. */
collapsedAssistants: ReadonlySet<number>
/** Stable Assistant record ids whose tool calls are folded. */
collapsedAssistants: ReadonlySet<string>
/** Toggle tool calls under one assistant record. */
onToggleAssistant: (index: number) => void
onToggleAssistant: (id: string) => void
/** One-shot cross-view inspect: open and scroll to this call's record. */
inspectCallId?: string | null
/** Acknowledge a consumed (or unresolvable) inspect request. */
@@ -427,6 +427,7 @@ function flattenRecords(turns: readonly TrajectoryTurnModel[]): TableRecord[] {
}
function virtualRecordHeight(record: TableRecord, final: boolean): number {
if (record.collapsedSummary !== undefined) return COLLAPSED_SUMMARY_HEIGHT_PX
if (record.cell.requestOnly !== true) return VIRTUAL_ROW_HEIGHT_PX
return final ? VIRTUAL_FINAL_REQUEST_HEIGHT_PX : 0
}
@@ -581,14 +582,17 @@ function summarizeAssistantTools(records: readonly TableRecord[]): string {
function collapseAssistantRecords(
records: readonly TableRecord[],
collapsedAssistants: ReadonlySet<number>,
collapsedAssistants: ReadonlySet<string>,
): TableRecord[] {
const out: TableRecord[] = []
for (let i = 0; i < records.length; i++) {
const record = records[i]
if (record === undefined) continue
out.push(record)
if (record.cell.kind !== 'message' || !collapsedAssistants.has(record.cell.index)) continue
if (
record.cell.kind !== 'message'
|| !collapsedAssistants.has(trajectoryRecordId(record.cell))
) continue
const calls: TableRecord[] = []
for (let j = i + 1; j < records.length; j++) {
const candidate = records[j]
@@ -1581,7 +1585,7 @@ export function TrajectoryTable({
inspectCallId = null,
onInspectApplied,
}: TrajectoryTableProps) {
const [selectedIndex, setSelectedIndex] = useState<number | null>(null)
const [selectedRecordId, setSelectedRecordId] = useState<string | null>(null)
const [selectedRequest, setSelectedRequest] = useState<SelectedRequest | null>(null)
const [activeTab, setActiveTab] = useState<DetailTab>('overview')
const [thinkingExpanded, setThinkingExpanded] = useState(false)
@@ -1596,14 +1600,18 @@ export function TrajectoryTable({
const followsTableTail = useRef(false)
const tableScrollInitialized = useRef(false)
const [tableScrollReady, setTableScrollReady] = useState(false)
const pendingScrollIndex = useRef<number | null>(null)
const pendingScrollRecordId = useRef<string | null>(null)
const loadingOlder = useRef(false)
const [olderLoading, setOlderLoading] = useState(false)
const olderLoadAnchor = useRef<OlderLoadAnchor | null>(null)
const allRecords = useMemo(() => flattenRecords(turns), [turns])
const selected = selectedRecordId === null
? undefined
: allRecords.find(record => trajectoryRecordId(record.cell) === selectedRecordId)
const selectedIndex = selected?.cell.index ?? null
useEffect(() => {
onSelectedIndexChange?.(selectedIndex)
}, [onSelectedIndexChange, selectedIndex])
const allRecords = useMemo(() => flattenRecords(turns), [turns])
const requestNumbers = useMemo(
() => indexRequestNumbers(allRecords, sessionRequestNumbers),
[allRecords, sessionRequestNumbers],
@@ -1631,7 +1639,7 @@ export function TrajectoryTable({
const record = records[index]
return record === undefined
? index
: `${record.cell.index}:${record.collapsedSummaryKind ?? 'record'}`
: `${trajectoryRecordId(record.cell)}:${record.collapsedSummaryKind ?? 'record'}`
},
getScrollElement: () => tablePaneRef.current,
initialRect: { width: 0, height: VIRTUAL_INITIAL_VIEWPORT_HEIGHT_PX },
@@ -1649,7 +1657,6 @@ export function TrajectoryTable({
})
: records.map((record, position) => ({ record, position }))
const requestBoundaryRuns = indexRequestBoundaryRuns(records)
const selected = allRecords.find(record => record.cell.index === selectedIndex)
const selectedPrompt = selected?.cell.kind === 'system'
? selected.cell.promptDetail
: undefined
@@ -1662,16 +1669,20 @@ export function TrajectoryTable({
? []
: allRecords.filter(record =>
record.turn === selectedRequest.turn
&& record.section === selectedRequest.section
&& record.group === selectedRequest.group,
)
const selectedRequestAssistant = selectedRequestRecords.find(
record => record.cell.kind === 'message',
)
const selectedRequestAnchor = selectedRequestAssistant ?? selectedRequestRecords[0]
const selectedRequestNumber = selectedRequest === null
? undefined
: requestNumbers.get(requestKey(selectedRequest.turn, selectedRequest.group))
const selectedRequestInfo = selectedRequest === null
? undefined
: sessionRequestNumbers?.find(request => request.number === selectedRequest.number)
: sessionRequestNumbers?.find(request => selectedRequest.seq === undefined
? request.turn === selectedRequest.turn && request.group === selectedRequest.group
: request.seq === selectedRequest.seq)
const selectedRequestState: RecordState | undefined = selectedRequest === null
? undefined
: selectedRequestInfo?.status
@@ -1715,7 +1726,9 @@ export function TrajectoryTable({
selectedRequestInfo?.cumulativeUsage ?? selectedRequestUsage
const selectedRequestOptions = selectedRequestInfo?.requestConfig
const activeTurn = selectedRequest === null ? selected?.turn : selectedRequest.turn
const activeSection = selectedRequest === null ? selected?.section : selectedRequest.section
const activeSection = selectedRequest === null
? selected?.section
: selectedRequestRecords[0]?.section
const selectedTabs = selectedRequest !== null
? REQUEST_TABS.filter(tab => tab.id !== 'options' || selectedRequestOptions !== undefined)
: selected === undefined ? [] : detailTabs(selected)
@@ -1727,13 +1740,17 @@ export function TrajectoryTable({
const selectedAssistantRequest = selected?.cell.kind === 'message'
? requestNumbers.get(requestKey(selected.turn, selected.group))
: undefined
const selectedAssistantRequestInfo = selectedAssistantRequest === undefined
? undefined
: sessionRequestNumbers?.find(request => request.number === selectedAssistantRequest)
const selectedAssistantRequestTarget: SelectedRequest | undefined =
selected !== undefined && selectedAssistantRequest !== undefined
? {
turn: selected.turn,
section: selected.section,
number: selectedAssistantRequest,
group: selected.group,
...(selectedAssistantRequestInfo?.seq === undefined
? {}
: { seq: selectedAssistantRequestInfo.seq }),
}
: undefined
const hasSelectedHierarchy = selectedAssistantRequestTarget !== undefined
@@ -1752,7 +1769,7 @@ export function TrajectoryTable({
}
const clearInspectorSelection = () => {
setSelectedIndex(null)
setSelectedRecordId(null)
setSelectedRequest(null)
}
@@ -1765,7 +1782,7 @@ export function TrajectoryTable({
const record = allRecords.find(candidate => candidate.cell.index === index)
onRecordSelect?.(index)
setSelectedRequest(null)
setSelectedIndex(index)
setSelectedRecordId(record === undefined ? null : trajectoryRecordId(record.cell))
if (record === undefined) return
const tabs = detailTabs(record)
const available = new Set(tabs.map(tab => tab.id))
@@ -1779,19 +1796,25 @@ export function TrajectoryTable({
) return
appliedRecordSelection.current = recordSelection
selectRecord(recordSelection.index)
pendingScrollIndex.current = recordSelection.index
}, [recordSelection, selectRecord])
const record = allRecords.find(candidate => candidate.cell.index === recordSelection.index)
pendingScrollRecordId.current = record === undefined
? null
: trajectoryRecordId(record.cell)
}, [allRecords, recordSelection, selectRecord])
useEffect(() => {
if (recordFocus === null || appliedRecordFocus.current === recordFocus) return
appliedRecordFocus.current = recordFocus
pendingScrollIndex.current = recordFocus.index
}, [recordFocus])
const record = allRecords.find(candidate => candidate.cell.index === recordFocus.index)
pendingScrollRecordId.current = record === undefined
? null
: trajectoryRecordId(record.cell)
}, [allRecords, recordFocus])
const selectRequest = (
request: SelectedRequest,
tab: 'overview' | 'timing' = 'overview',
) => {
setSelectedIndex(null)
setSelectedRecordId(null)
setSelectedRequest(request)
activateTab(tab)
}
@@ -1804,12 +1827,13 @@ export function TrajectoryTable({
const candidate = allRecords[i]
if (candidate === undefined || candidate.turn !== target.turn) break
if (candidate.cell.kind !== 'message') continue
if (collapsedAssistants.has(candidate.cell.index)) onToggleAssistant(candidate.cell.index)
const assistantId = trajectoryRecordId(candidate.cell)
if (collapsedAssistants.has(assistantId)) onToggleAssistant(assistantId)
break
}
}
setSelectedRequest(null)
setSelectedIndex(target.cell.index)
setSelectedRecordId(trajectoryRecordId(target.cell))
activateTab('overview')
}
@@ -1829,22 +1853,24 @@ export function TrajectoryTable({
const target = flattenRecords(turns).find(record => record.cell.callId === inspectCallId)
if (target === undefined) return
openRecordSummaryRef.current(target)
pendingScrollIndex.current = target.cell.index
pendingScrollRecordId.current = trajectoryRecordId(target.cell)
onInspectApplied?.()
}, [inspectCallId, turns, onInspectApplied])
useEffect(() => {
const index = pendingScrollIndex.current
if (index === null) return
const id = pendingScrollRecordId.current
if (id === null) return
const position = records.findIndex(record =>
record.cell.index === index && record.collapsedSummary === undefined)
trajectoryRecordId(record.cell) === id && record.collapsedSummary === undefined)
if (position === -1) return
pendingScrollIndex.current = null
pendingScrollRecordId.current = null
if (virtualizationEnabled) {
rowVirtualizer.scrollToIndex(position, { behavior: 'smooth', align: 'center' })
return
}
const row = rootRef.current
?.querySelector<HTMLElement>(`tr[data-record-index="${index}"]`)
const recordIndex = records[position]?.cell.index
const row = recordIndex === undefined
? null
: rootRef.current?.querySelector<HTMLElement>(`tr[data-record-index="${recordIndex}"]`)
/* v8 ignore next -- jsdom lacks scrollIntoView; browsers always have it. */
if (row !== undefined && row !== null && typeof row.scrollIntoView === 'function') {
row.scrollIntoView({ behavior: 'smooth', block: 'center' })
@@ -2027,14 +2053,13 @@ export function TrajectoryTable({
: `Request #${request}${requestInfo?.purpose === 'compaction' ? ' · Compaction' : ''}`
const requestSelected = request !== undefined
&& selectedRequest?.turn === record.turn
&& selectedRequest.section === record.section
&& selectedRequest.number === request
&& selectedRequest.group === record.group
const sectionActive = record.turn === null
? activeSection === record.section
: activeTurn === record.turn
return (
<tr
key={`${record.cell.index}:${record.collapsedSummaryKind ?? 'record'}`}
key={`${trajectoryRecordId(record.cell)}:${record.collapsedSummaryKind ?? 'record'}`}
tabIndex={isRequestOnly ? -1 : 0}
aria-label={isCollapsedSummary
? `Collapsed ${record.collapsedSummaryKind} summary, ${record.collapsedSummary}`
@@ -2064,7 +2089,7 @@ export function TrajectoryTable({
? () => {
if (record.collapsedSummaryKind === 'turn' && record.turn !== null) {
onToggleTurn(record.turn)
} else onToggleAssistant(record.cell.index)
} else onToggleAssistant(trajectoryRecordId(record.cell))
}
: () => { selectRecord(record.cell.index) }}
onDoubleClick={(event) => {
@@ -2079,7 +2104,7 @@ export function TrajectoryTable({
&& assistantToolCalls(allRecords, record.cell.index).length > 0
) {
event.preventDefault()
onToggleAssistant(record.cell.index)
onToggleAssistant(trajectoryRecordId(record.cell))
return
}
if (!record.turnStart) return
@@ -2098,7 +2123,7 @@ export function TrajectoryTable({
if (isCollapsedSummary) {
if (record.collapsedSummaryKind === 'turn' && record.turn !== null) {
onToggleTurn(record.turn)
} else onToggleAssistant(record.cell.index)
} else onToggleAssistant(trajectoryRecordId(record.cell))
return
}
selectRecord(record.cell.index)
@@ -2121,9 +2146,8 @@ export function TrajectoryTable({
event.stopPropagation()
selectRequest({
turn: record.turn,
section: record.section,
number: request,
group: record.group,
...(requestInfo?.seq === undefined ? {} : { seq: requestInfo.seq }),
})
}}
onDoubleClick={(event) => { event.stopPropagation() }}
@@ -2355,7 +2379,7 @@ export function TrajectoryTable({
<>
<span className={css.requestDetailsDot} aria-hidden="true" />
<span className={css.requestDetailsName}>
Request #{selectedRequest.number}
Request #{selectedRequestNumber ?? '—'}
</span>
<span className={css.detailsLocation}>
{selectedRequestInfo?.purpose === 'compaction'
@@ -2655,7 +2679,7 @@ export function TrajectoryTable({
selectRequest(selectedAssistantRequestTarget)
}}
>
<span>Request #{selectedAssistantRequestTarget.number}</span>
<span>Request #{selectedAssistantRequest ?? '—'}</span>
<IconChevronRightOutline14
className={css.overviewHierarchyJumpIconTight}
size={11}
packages/client/ui-trajectory/src/client/TrajectoryTimeline.module.css
+2 -1
View File
@@ -155,7 +155,7 @@
top: calc(var(--trajectory-span-lane) * 14px);
left: calc(var(--trajectory-span-left) + var(--trajectory-span-gap));
width: max(
0px,
2px,
calc(
var(--trajectory-span-width)
- var(--trajectory-span-gap)
@@ -163,6 +163,7 @@
)
);
height: 8px;
min-width: 2px;
border-radius: 1px;
background: var(--dsw-alias-label-secondary);
opacity: 0.78;
packages/client/ui-trajectory/src/client/TrajectoryView.tsx
+41 -16
View File
@@ -26,9 +26,11 @@ import {
type TrajectoryTimelineMode,
type TrajectoryTimeRange,
} from './timeline.ts'
import { trajectoryRecordId } from './trajectory-record.ts'
import css from './views.module.css'
const EMPTY_IDS: ReadonlySet<number> = new Set()
const EMPTY_TURN_IDS: ReadonlySet<number> = new Set()
const EMPTY_RECORD_IDS: ReadonlySet<string> = new Set()
function lastCellIndex(turns: readonly TrajectoryTurnModel[]): number {
let last = 0
@@ -172,15 +174,23 @@ function searchMatches(
return matches
}
function mergeSearchMatches(
finalized: ReadonlySet<number> | null,
partial: ReadonlySet<number> | null,
): ReadonlySet<number> | null {
if (finalized === null || partial === null) return null
return new Set([...finalized, ...partial])
}
export function TrajectoryView({
useHistory, useDuration, loadHistoryTail, loadOlderHistory, setActualDuration,
inspect, onInspectDone,
}: ConvViewProps & InjectFace<TrajectoryViewInjected>) {
const [collapsedTurns, setCollapsedTurns] = useState<ReadonlySet<number>>(EMPTY_IDS)
const [collapsedTurns, setCollapsedTurns] = useState<ReadonlySet<number>>(EMPTY_TURN_IDS)
const [collapsedAssistants, setCollapsedAssistants] =
useState<ReadonlySet<number>>(EMPTY_IDS)
useState<ReadonlySet<string>>(EMPTY_RECORD_IDS)
const [timelineSelection, setTimelineSelection] = useState<{
branchId: number
branchKey: string
range: TrajectoryTimeRange
} | null>(null)
const actualDuration = useDuration(value => value)
@@ -197,6 +207,7 @@ export function TrajectoryView({
const historyLoading = useHistory(snapshot =>
snapshot.state === 'cold' || snapshot.state === 'loading')
const hasOlderHistory = useHistory(snapshot => snapshot.hasMore)
const historyBaseSeq = useHistory(snapshot => snapshot.baseSeq)
const nodes = inspection.eventNodes
const partial = inspection.partial
const runningCalls = inspection.runningCalls
@@ -382,11 +393,23 @@ export function TrajectoryView({
const timelineMode: TrajectoryTimelineMode = actualDuration
? actualTime ? 'actual' : 'duration'
: actualTime ? 'time' : 'sequence'
const searchMatchIndexes = useMemo(
() => searchMatches(turns, searchQuery),
[searchQuery, turns],
const finalizedSearchMatches = useMemo(
() => searchMatches(finalized.turns, searchQuery),
[finalized, searchQuery],
)
const timelineRange = timelineSelection?.branchId === currentBranch.id
const partialSearchTurns = useMemo(
() => appendTrajectoryPartialLayout([], partial, finalized.lastIndex),
[finalized.lastIndex, partial],
)
const partialSearchMatches = useMemo(
() => searchMatches(partialSearchTurns, searchQuery),
[partialSearchTurns, searchQuery],
)
const searchMatchIndexes = useMemo(
() => mergeSearchMatches(finalizedSearchMatches, partialSearchMatches),
[finalizedSearchMatches, partialSearchMatches],
)
const timelineRange = timelineSelection?.branchKey === currentBranch.key
? timelineSelection.range
: null
const timelineFocusIndexes = useMemo(
@@ -420,14 +443,16 @@ export function TrajectoryView({
const allTurnsCollapsed = collapsibleTurnIds.length > 0
&& collapsibleTurnIds.every(turn => collapsedTurns.has(turn))
const collapsibleAssistantIds = useMemo(() => {
const ids: number[] = []
const ids: string[] = []
for (const turn of turns) {
const cells = turn.groups.flatMap(group => group.cells)
for (let i = 0; i < cells.length; i++) {
const cell = cells[i]
if (cell?.kind !== 'message') continue
const next = cells[i + 1]
if (next?.kind === 'tool' || next?.kind === 'subtool') ids.push(cell.index)
if (next?.kind === 'tool' || next?.kind === 'subtool') {
ids.push(trajectoryRecordId(cell))
}
}
}
return ids
@@ -456,11 +481,11 @@ export function TrajectoryView({
})
}
const toggleAssistant = (index: number) => {
const toggleAssistant = (id: string) => {
setCollapsedAssistants((current) => {
const collapsed = new Set(current)
if (collapsed.has(index)) collapsed.delete(index)
else collapsed.add(index)
if (collapsed.has(id)) collapsed.delete(id)
else collapsed.add(id)
return collapsed
})
}
@@ -514,7 +539,7 @@ export function TrajectoryView({
searchMatchIndexes={searchMatchIndexes}
onRangeChange={(range) => {
setTimelineSelection(range === null ? null : {
branchId: currentBranch.id,
branchKey: currentBranch.key,
range,
})
}}
@@ -529,7 +554,7 @@ export function TrajectoryView({
/>
<div className={css.ledger}>
<TrajectoryTable
key={currentBranch.id}
key={currentBranch.key}
requestNumbers={requestNumbers}
turns={turns}
timelineFocusIndexes={timelineFocusIndexes}
@@ -539,7 +564,7 @@ export function TrajectoryView({
recordSelection={timelineRecordSelection}
recordFocus={timelineRecordFocus}
historyLoading={historyLoading}
historyStartSeq={nodes.at(0)?.seq}
historyStartSeq={historyBaseSeq}
hasOlderRecords={hasOlderHistory}
onLoadOlder={loadEarlierHistory}
onClearSelection={() => { setTimelineSelection(null) }}
packages/client/ui-trajectory/src/client/context-branches.ts
+7
View File
@@ -7,6 +7,8 @@ import type {
/** One continuous context branch; compactions stay inline while rewinds start a successor branch. */
export interface TrajectoryContextBranch {
id: number
/** Identity stable when older context generations are prepended. */
key: string
contexts: readonly ConversationContext[]
latest: ConversationContext
nodes: readonly ConversationNode[]
@@ -18,6 +20,7 @@ export interface TrajectoryContextBranch {
interface MutableBranch {
id: number
key: string
contexts: ConversationContext[]
latest: ConversationContext
nodes: Map<number, ConversationNode>
@@ -63,6 +66,9 @@ export function deriveTrajectoryContextBranches(
)
mutable.push({
id: context.id,
key: context.origin === 'rewind' && context.originSeq !== undefined
? `rewind:${context.originSeq}`
: 'root',
contexts: [context],
latest: context,
nodes: new Map(
@@ -84,6 +90,7 @@ export function deriveTrajectoryContextBranches(
}
return mutable.map(branch => ({
id: branch.id,
key: branch.key,
contexts: branch.contexts,
latest: branch.latest,
nodes: [...branch.nodes.values()].sort((left, right) => left.seq - right.seq),
packages/client/ui-trajectory/src/client/layout.ts
+8 -1
View File
@@ -517,10 +517,16 @@ export function appendTrajectoryPartialLayout(
const group = groups[groupIndex]
/* v8 ignore next -- findIndex proved the dense array position exists. */
if (group === undefined) continue
const streamedCallIds = new Set(
streamedGroup.cells.flatMap(cell => cell.callId === undefined ? [] : [cell.callId]),
)
groups[groupIndex] = {
...streamedGroup,
cells: [
...group.cells.filter(cell => cell.requestOnly !== true),
...group.cells.filter(cell =>
cell.requestOnly !== true
&& (cell.callId === undefined || !streamedCallIds.has(cell.callId)),
),
...streamedGroup.cells,
],
}
@@ -641,6 +647,7 @@ function expandAssistant(
.join('\n\n')
const message: TrajectoryCellProps = {
index: ++index,
recordId: `assistant\u0000${node.turn}\u0000${node.step}`,
kind: 'message',
sourceSeq: node.seq,
text: messageText !== ''
packages/client/ui-trajectory/src/client/trajectory-record.ts
+14
View File
@@ -37,6 +37,8 @@ export interface TrajectorySourceBlock {
export interface TrajectoryCellProps extends HTMLAttributes<HTMLDivElement> {
/** 1-based record index shown as `#N`. */
index: number
/** Projection-stable identity when no single source event owns the record lifecycle. */
recordId?: string
kind: TrajectoryCellKind
/** Single-line summary; CSS ellipsis when it overflows. */
text: string
@@ -91,6 +93,18 @@ export interface TrajectoryCellProps extends HTMLAttributes<HTMLDivElement> {
selected?: boolean
}
/**
* Resolve the identity that survives prepending older projected records.
* @param cell - Projected trajectory record.
* @returns Stable identity from the owning event or tool call, with a fixture fallback.
*/
export function trajectoryRecordId(cell: TrajectoryCellProps): string {
if (cell.recordId !== undefined) return cell.recordId
if (cell.callId !== undefined) return `${cell.kind}\u0000call\u0000${cell.callId}`
if (cell.sourceSeq !== undefined) return `${cell.kind}\u0000seq\u0000${cell.sourceSeq}`
return `${cell.kind}\u0000index\u0000${cell.index}`
}
/**
* Format own-duration for the trailing time column.
* @param seconds - Duration seconds, or `null` when absent.