usb_detect offered a Ventoy stick's 32M VTOYEFI ESP as a sync/backup
target: with the data partition unmounted it was the only mounted
candidate, and cp died mid-copy with 'No space left on device'.
Detection now reads FSTYPE/PARTTYPENAME and drops EFI system
partitions from both the mounted list and the mount-offer list;
USB_MOUNTED entries carry mp|label|size|model|fs and usb_pick_root
shows that in the single-stick confirm and the multi-stick/partition
picker (USB_ROOT stays a bare mountpoint). pos-media-sync pre-flights
the exact payload size vs df free space (err, or warn under --dry-run)
before any copy.
GNU find (default -P) does not descend a command-line symlink to a
directory, so `find $HOME/Music ...` returned zero files and the tool
reported '0 added, 0 updated, 0 unchanged' without creating the target.
Switch to `find -H` (follows only command-line symlinks; inner-symlink
semantics unchanged).
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