feat: add utility functions for formatting duration and file size

src/lib/format.ts

@@ -0,0 +1,38 @@
+/**
+ * Utility functions for formatting data for display
+ */
+
+export function formatDuration(durationMs: number): string {
+  if (!durationMs) return "0s"
+  
+  const totalSeconds = Math.floor(durationMs / 1000)
+  const hours = Math.floor(totalSeconds / 3600)
+  const minutes = Math.floor((totalSeconds % 3600) / 60)
+  const seconds = totalSeconds % 60
+  
+  if (hours > 0) {
+    return `${hours}h ${minutes}m ${seconds}s`
+  }
+  if (minutes > 0) {
+    return `${minutes}m ${seconds}s`
+  }
+  return `${seconds}s`
+}
+
+export function formatFileSize(sizeBytes: number): string {
+  if (!sizeBytes) return "0 B"
+  
+  const units = ["B", "KB", "MB", "GB", "TB"]
+  let size = sizeBytes
+  let unitIndex = 0
+  
+  while (size >= 1024 && unitIndex < units.length - 1) {
+    size /= 1024
+    unitIndex++
+  }
+  
+  if (unitIndex === 0) {
+    return `${Math.floor(size)} ${units[unitIndex]}`
+  }
+  return `${size.toFixed(1)} ${units[unitIndex]}`
+}