mapsize 1.1.0: nested treemap reaches deep folders

The map stopped nesting after a fixed 3 levels, so at / a chain like
mnt/raid/media used the whole budget on full-size wrappers and showed
empty boxes with only titles. Single-child directory chains now collapse
into one label, nesting depth is bounded by block size instead of a fixed
cap, and nested blocks show size and percentage of their parent.

internal/brand/brand.go

@@ -8,4 +8,4 @@ const (
 )
 
 // Version is stamped at release time via -ldflags -X.
-var Version = "1.0.0"
+var Version = "1.1.0"