── Test: footer line rejects all edits ──

── Test: edit on header line (Name and Type valid, Value invalid) ──

── Test: inline edit lifecycle (begin → commit → re-edit) ──

── Test: full inline edit round-trip (type in editor → commit → verify provider) ──

── Test: insertNode adds a node, removeNode removes it, undo restores ──

── Test: mouse click during edit commits it ──

── Test: no IBeam after click then mouse-move to non-editable area ──

── Test: Padding line rejects value editing ──

── Test: resolvedSpanFor rejects Value on Padding (defense-in-depth) ──

── Test: Padding value edit is effectively blocked at controller level ──