feat: mail composition

Signed-off-by: Sebastian <krupinski01@gmail.com>

src/utile/format.ts

@@ -0,0 +1,21 @@
+export function formatFileSize(bytes: number | null | undefined): string {
+  if (bytes == null || !Number.isFinite(bytes)) {
+    return ''
+  }
+
+  if (bytes < 1024) {
+    return `${Math.max(0, Math.round(bytes))} B`
+  }
+
+  const units = ['KB', 'MB', 'GB', 'TB']
+  let value = bytes / 1024
+  let unitIndex = 0
+
+  while (value >= 1024 && unitIndex < units.length - 1) {
+    value /= 1024
+    unitIndex += 1
+  }
+
+  const precision = value >= 10 || unitIndex === 0 ? 1 : 2
+  return `${value.toFixed(precision)} ${units[unitIndex]}`
+}