add datasize helper and add correct sorting to sitestable

src/lib/dataSize.ts

@@ -0,0 +1,11 @@
+export function parseDataSize(sizeStr: string): number {
+  if (!sizeStr) return 0;
+  const match = sizeStr.trim().toUpperCase().match(/^([\d.]+)\s*([KMGT]?B)$/);
+  if (!match) return 0;
+  const [, numStr, unit] = match;
+  const num = parseFloat(numStr) || 0;
+  const multipliers: Record<string, number> = {
+    B: 1, KB: 1024, MB: 1024**2, GB: 1024**3, TB: 1024**4,
+  };
+  return num * (multipliers[unit] || 1);
+}