fix(media): a sweep carries the emptied folder's own empty subfolders

The live sweep removed 2271 husks and left 146 standing, every one a release
folder blocked by a junk subfolder (Screens/, Sample/, a BDMV leaf) that no
file ever moved out of. Eligibility was per-folder, so the blocker was never a
target and its parent could never be removed.

Proof now carries downward: inside a folder the journal shows emptied, every
empty directory qualifies. Nothing under such a folder can hold data, and every
removal is still journalled as rmdir and undone by rollback.

The new test is red against the previous revision, green now. The live sweep
touched no file: 8193 before, 8193 after.

tests/media_relayout.bats

@@ -408,6 +408,17 @@ PY
     [ -d "$LIB/A Empty Placeholder" ]
 }
 
+@test "a swept folder carries the empty junk folders inside it" {
+    mkdir -p "$LIB/AMERICAN POP/Screens"   # screenshots, never a move source
+    plan
+    apply_plan
+    run python3 "$APPLY" sweep --root "$LIB" --journal "$JOURNAL" --apply
+    [ "$status" -eq 0 ]
+    [[ "$output" == *"0 left in place"* ]]
+    [ ! -e "$LIB/AMERICAN POP/Screens" ]
+    [ ! -e "$LIB/AMERICAN POP" ]
+}
+
 @test "sweep without --apply reports the husks and changes nothing" {
     plan
     apply_plan