Command Palette: Delete Selection asks first, as the Layers panel does

The palette listed the Layers panel's Delete Selection twice: as
Window › Layers › Delete Selection, which ran layer.delete and deleted a
layer holding art without asking, and as a bare Delete Selection, which
ran ui.layerDelete and asked first.

- The palette now lists one Window › Layers › Delete Selection result,
  which runs ui.layerDelete, so a pick asks before deleting a layer or
  sublayer that holds art. Scripts and the control channel still run
  layer.delete at once.
- New Brush…, Brush Options…, Symbol Options…, Import SVG Filter… and
  Convert to Text were also listed twice under the same name, once as
  the engine command, which the palette ran with no params. Each is now
  listed once, as the UI command that opens its dialog or file chooser
  or acts on the edited paragraphs.
- A search for a wrapped engine command's id or menu path still finds
  the one result.

Docs: docs/target-app-parity.md (Layers panel deletion).

docs/target-app-parity.md

@@ -1172,6 +1172,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   The Filter button at the right of Search All keeps the rows that are of an object kind ticked under By Object (paths, shapes, text, images, effects, groups, linked files, guides) and in a state ticked under By Layer (locked, hidden), with the rows that hold them; a section with nothing ticked takes every row. The filter combines with the search, the button is lit while a filter is on, and Clear All in its popup turns the filter off (`ui.layersFilter`). The filter lasts the session.
   The panel menu's Save Selection submenu has Save Selection…, Update Selection and Edit Selection…, enabled and run as in the Select menu, and lists the document's saved selections: choosing one selects its objects again (`select.recall`).
   Deleting rows from the Layers panel (the trash button, rows dragged onto it, the panel menu's Delete Selection, and Delete or Backspace on highlighted rows) asks "Delete this layer and its artwork?" when a layer or sublayer among them holds art, hidden, locked and nested art included, and "Delete the selected items and their artwork?" when several rows are deleted; OK deletes the rows it asked about in one undo step, and Cancel keeps them (`ui.layerDelete`). The help page's shortcut list names the Layers panel as the place where deleting asks for confirmation ([Default keyboard shortcuts](https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html)). An empty layer, a layer with only guides, and groups or objects alone are deleted without a question, and `layer.delete` itself does not ask (`panels::layers` tests `deleting_a_layer_that_holds_art_asks_first`, `delete_selection_asks_only_for_layers_with_art`).
+  The Command Palette lists Window › Layers › Delete Selection once, as the Layers panel's `ui.layerDelete`, so a pick asks the same question; it does not list `layer.delete`, which scripts run without a question. New Brush…, Brush Options…, Symbol Options…, Import SVG Filter… and Convert to Text are also listed once each, as the UI command that opens the dialog or file chooser (`palette` tests `a_wrapped_engine_command_is_listed_once_as_its_ui_command`, `a_pick_of_delete_selection_asks_before_deleting_a_layer_with_art`).
   `object.setProps` with `visible: false` or `locked: true` deselects every selected object that is then hidden or locked, the key object included, as the eye and lock columns do.
   Ctrl/Cmd+Alt-clicking an eye switches the other layers to Outline and the row's layer to Preview, or switches all layers back to Preview when the others are in Outline (`layer.outlineOthers`, `layer.previewAll`).
   Ctrl/Cmd+Alt-clicking New Layer adds a layer directly below the current layer, at its level (`layer.new {below: true}`), and Ctrl/Cmd+Alt-clicking New Sublayer adds a sublayer under the contents of the layer it goes into (`layer.newSublayer {bottom: true}`), each in one undo step. The reference app's [Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page lists these clicks for placing a layer below the selected layer and a new sublayer at the bottom of the layer list.