The /_perf/dashboard-load server route no longer exists, so every
reportDashboardPerf() call was a silently-swallowed 404. Remove the helper
in legacy.ts plus its five call sites in App.tsx / useProjects.ts (the
companion console.log lines stay), and drop the dashboard-perf.log entry
from the test-isolation runtime ignore list since nothing writes that file
anymore.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>