Refactor round 2: fold duplicated command and inspector code

- applyCommands sit on ObjectEditCommand with a revert hook instead of
  five copies of the same preamble and undo
- actionIf replaces six identical Reset/Apply menu blocks, addNameField
  the three name rows, assetLink the two asset links
- requireStructuralObject replaces ten two-line preambles and drops the
  duplicate holder lookup
- __gm.objectsOf had no caller; the SMB remnant in e2e.sh is gone

Proven: check.sh 797 tests, full e2e 633 checks, smokes 24/19/20 against
the same bundle.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/ui/index.ts

@@ -16,7 +16,7 @@ export { type DropSpot, ListView, type ListItem, type PickModifiers } from './wi
 export { Popup, type PopupOptions } from './widgets/Popup';
 export { Menu, type MenuItem, type MenuOptions } from './widgets/Menu';
 export { Dialog, type DialogButton } from './widgets/Dialog';
-export { TextField } from './widgets/TextField';
+export { TextField, type TextFieldOptions } from './widgets/TextField';
 export { NumberField } from './widgets/NumberField';
 export { ColorField } from './widgets/ColorField';
 export { ColorPicker } from './widgets/ColorPicker';