Brushes: Delete Brush asks Yes or No for unused brushes, and Remove Strokes or Cancel for brushes in use

The question for brushes no stroke uses reads "Delete the brush selection?" with Yes and No, from the bottom button and the panel menu, and Alt-click (Option-click on macOS) on the button still deletes them without asking. When a stroke uses one of the brushes, the button, Alt-click and the menu item ask with Remove Strokes and Cancel; Remove Strokes deletes the brushes and the strokes that used them become plain strokes.

brush.unused also counts the tile that pattern editing's Cancel puts back, which brush.delete already clears, so the panel asks the in-use question for a brush only that tile uses.

docs/mcp.md

@@ -1557,8 +1557,10 @@ already walks Image Trace. Short agent entry points:
   name they are given, as `symbol.options` trims `newName`; a blank one gives "New Symbol" or "<name> copy".
 - The Brushes panel menu's Select All Unused: `brush.unused` (a query) lists the brushes no stroke paints with, in
   library order, and the panel selects them. Strokes in the art (opacity masks included), symbols, graph designs,
-  pattern tiles and graphic styles count, and so do the strokes in the art of a brush that is used. The art of a brush
-  that is not used does not count, so a brush whose own art is the only art that paints with it is listed.
+  pattern tiles (with the tiles that pattern editing's Cancel puts back) and graphic styles count, and so do the
+  strokes in the art of a brush that is used. The art of a brush that is not used does not count, so a brush whose own
+  art is the only art that paints with it is listed. The panel's Delete Brush asks Yes/No when every brush it deletes
+  is unused, and offers Remove Strokes or Cancel when one of them is in use.
 - Brushes: `brush.list`, `brush.get {name}`, `brush.apply {name, ids?}`, `brush.new {type, name?, params?, ids?}`,
   `brush.setCurrent {name}`, `brush.options {name, params?, newName?}`, `brush.delete {name} | {names}`,
   `brush.duplicate {name, newName?} | {names}`, `brush.freehand`, `object.expandBrush {ids?}`. `brush.new`,

docs/target-app-parity.md

@@ -962,7 +962,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     Hue Shift set by `brush.new` or `brush.options` without a key color takes the color the art's fills and strokes use most, as Brush Options already offers it, following the Brushes page, where the key color defaults to the color that stands out most in the art (<https://web.archive.org/web/20241230205225/https://helpx.adobe.com/illustrator/using/brushes.html>). The page does not state how prominence is measured. Counting the fills and strokes that use each solid color, with the first one found winning a tie and black for art with no solid color, is VectorCraft's own rule. A `brush.options` edit that gives only the method keeps the brush's key color, and one that gives only an art brush's start guide keeps its end guide. Evidence: `tests_brushsym::hue_shift_without_a_key_takes_the_most_used_art_color`, `tests_brushsym::art_brush_options_keep_the_scale_fields_an_edit_leaves_out`.
     Bristle Brush Options and `brush.new` take a bristle brush name of at most 31 characters, as the Brushes page states for the Bristle Brush Options. The Name field stops taking characters at 31, and `brush.new` and `brush.options` refuse a longer new name with an error that names the limit. The page does not say how the limit counts characters or what happens to longer names already saved; counting characters and the number added to a taken name, keeping longer saved names, and leaving `brush.duplicate` unlimited are VectorCraft's own rules. A bristle brush that a document or a saved file already holds under a longer name keeps it, and the other brush types take a name of any length. Test: `bristle_brush_names_have_at_most_31_characters` in `tests/brushsym.rs`. Public reference: [Brushes](https://web.archive.org/web/20241230205225/https://helpx.adobe.com/illustrator/using/brushes.html) (archived copy).
     In the Brushes panel, Shift-click selects a range of brushes and Ctrl/Cmd-click adds or removes one. Delete Brush and Duplicate Brush then act on all of them (`brush.delete {names}`, `brush.duplicate {names}`).
-    The bottom Delete Brush button and the panel menu ask before deleting; Alt-click (Option-click on macOS) on the button deletes without asking.
+    The Brushes panel's Delete Brush button and panel menu item ask "Delete the brush selection?" with Yes and No when none of the brushes is in use. Alt-click (Option-click on macOS) on the button deletes them without asking, as the [Default keyboard shortcuts](https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page lists ("Delete without confirmation (except for Layers panel)"). When a stroke uses one of the brushes, the button, Alt-click and the menu item all ask with Remove Strokes and Cancel; Remove Strokes deletes the brushes and the strokes that used them become plain strokes. Tests: `panels::brushes::tests`, `dialogs::brush_delete::tests`.
     Document Info has a Brushes category after Graphic Styles. It lists the Brushes panel's brushes, or with Selection Only it lists the brushes that the selected objects' strokes use. The Document Info report and Package's report list them too (`document.info {category: "brushes"}`, `brushNames`).
     Document Info has a Repeat Objects category after Embedded Images. It lists each radial, grid and mirror Repeat object by name with its kind and the number of instances it makes. For a grid it gives the rows and columns instead, followed by the number of instances it draws when that is fewer. With Selection Only it lists the Repeat objects in the selection. The Document Info report and Package's report list them too (`document.info {category: "repeats"}`, `repeatObjects`).
     The Brushes panel menu's Select All Unused selects the brushes that are not used in the document, as the [Brushes](https://web.archive.org/web/20241230205225/https://helpx.adobe.com/illustrator/using/brushes.html) page (archived copy) describes. A brush counts as used when a stroke paints with it in the art (opacity masks included), in symbols, graph designs, pattern tiles or graphic styles, or in the art of a used brush (`brush.unused`).