fix(perf): Fix project lookup when multiple projects selected

eventView.project is a number array. Using a template literal on the
whole array produces "1,2" with multiple projects, which never matches
any project ID. Use the first element instead, matching the pattern in
useEventViewProject.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mjq

static/app/views/performance/eap/sampledEventsTable.tsx

@@ -123,7 +123,7 @@ export function SampledEventsTable({eventView, transactionName, maxDuration}: Pr
   const theme = useTheme();
   const organization = useOrganization();
 
-  const project = projects.find(p => p.id === `${eventView.project}`);
+  const project = projects.find(p => p.id === String(eventView.project[0]));
   const projectSlug = project?.slug;
 
   const showReplayColumn =

static/app/views/performance/eap/segmentSpansTable.tsx

@@ -63,7 +63,7 @@ export function SegmentSpansTable({
   const {projects} = useProjects();
   const navigate = useNavigate();
 
-  const projectSlug = projects.find(p => p.id === `${eventView.project}`)?.slug;
+  const projectSlug = projects.find(p => p.id === String(eventView.project[0]))?.slug;
   const spanCategory = decodeScalar(location.query?.[SpanFields.SPAN_CATEGORY]);
   const {selected, options} = getEAPSegmentSpansListSort(location, spanCategory);