Initial scaffold: Researcher Endorsement frontend

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/utils/fileHelpers.ts

@@ -0,0 +1,11 @@
+export const formatTime = (ts: number) => {
+  const diff = Date.now() - ts
+  const sec = Math.floor(diff / 1000)
+  if (sec < 60) return `${sec}s`
+  const min = Math.floor(sec / 60)
+  if (min < 60) return `${min}m`
+  const hr = Math.floor(min / 60)
+  if (hr < 24) return `${hr}h`
+  const day = Math.floor(hr / 24)
+  return `${day}d`
+}