fix: use Base-10 sizes and mdls logical size to match macOS Finder

- Switch bytes_to_human (shell) and humanizeBytes (Go) from Base-2
  (1024) to Base-10 (1000) to match Apple's storage calculation
  standard since Snow Leopard
- Add proper decimal rounding instead of truncation
- Use mdls kMDItemLogicalSize for .app bundles to avoid APFS clone
  file undercounting by du

Fixes #511

cmd/analyze/format.go

@@ -80,7 +80,7 @@ func humanizeBytes(size int64) string {
 	if size < 0 {
 		return "0 B"
 	}
-	const unit = 1024
+	const unit = 1000
 	if size < unit {
 		return fmt.Sprintf("%d B", size)
 	}
@@ -90,7 +90,7 @@ func humanizeBytes(size int64) string {
 		exp++
 	}
 	value := float64(size) / float64(div)
-	return fmt.Sprintf("%.1f %cB", value, "KMGTPE"[exp])
+	return fmt.Sprintf("%.1f %cB", value, "kMGTPE"[exp])
 }
 
 func coloredProgressBar(value, maxValue int64, percent float64) string {