fix(ui-v2): fall back to expected_start_time in accordion header timestamp

When sorting by EXPECTED_START_TIME_DESC, the last run may be a
scheduled/paused run with null start_time. Fall back to
expected_start_time so the header still shows a timestamp.

Co-authored-by: Alexander Streed <alexander.streed@prefect.io>
Co-Authored-By: alex.s <ajstreed1@gmail.com>

Author: 3 people

ui-v2/src/components/dashboard/flow-runs-accordion/flow-runs-accordion-header.tsx

@@ -63,9 +63,14 @@ export function FlowRunsAccordionHeader({
 					className="text-sm font-medium text-foreground hover:underline flex items-center gap-1"
 					onClick={(e) => e.stopPropagation()}
 				/>
-				{lastFlowRun?.start_time && (
+				{(lastFlowRun?.start_time ?? lastFlowRun?.expected_start_time) && (
 					<FormattedDate
-						date={new Date(lastFlowRun.start_time)}
+						date={
+							new Date(
+								(lastFlowRun?.start_time ??
+									lastFlowRun?.expected_start_time) as string,
+							)
+						}
 						format="relative"
 						className="text-xs text-muted-foreground"
 					/>