fix: pos media sync finds nothing when the source dir is a symlink

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).

bin/pos-media-sync

@@ -128,7 +128,7 @@ while IFS= read -r f; do
     else
         unchanged=$((unchanged + 1))
     fi
-done < <(find "$SRC" "${find_expr[@]}" | sort)
+done < <(find -H "$SRC" "${find_expr[@]}" | sort)
 
 if [ "$DRY_RUN" -eq 1 ]; then
     echo "DRY RUN — nothing copied. Would sync: ${added} new, ${updated} updated, ${unchanged} unchanged → $dest_root"