Pencil: the cursor shows a star before a press that draws a new path

Draw freeform paths with the Pencil tool says a small star appears on
the Pencil when it is ready to draw a freeform path, and Reshape paths
with the Pencil tool says the star disappears over a selected path the
drag reshapes. The Pencil cursor had no star.

- New Cursor::PencilNew: the Pencil's crosshair with a small star where
  the closing cursor has its ring. It becomes the crosshair with Use
  Precise Cursors and as a system cursor.
- The Pencil shows it before a press when neither find_extend nor
  find_redraw (the lookups the press uses, within Edit Selected Paths)
  finds a selected path under the pointer. Over such a path and while a
  stroke is drawn, the cursor has no star.

Docs: docs/target-app-parity.md.

docs/target-app-parity.md

@@ -678,6 +678,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     Double-clicking the Line Segment, Arc, Rectangular Grid or Polar Grid tool opens its Tool Options, as step 3 of the [Rectangular Grid tool](https://helpx.adobe.com/illustrator/using/tool-techniques/rectangular-grid-tool.html) and [Arc tool](https://helpx.adobe.com/illustrator/using/tool-techniques/arc-tool.html) pages and the [Tools](https://helpx.adobe.com/illustrator/using/tools.html) page describe (#2691): the dialog a click with the tool opens, without a place to draw. Line Segment Tool Options has Length, Angle and Fill Line (a new line takes the current fill, `shape.line` `fill`); Arc Segment Tool Options its lengths, Reference Point, Type, Base Along, Slope and Fill Arc; the grids' Tool Options the Reference Point, Default Size, dividers, skews and switches. OK draws nothing: the next drag draws with the options and a click's dialog opens at them, the Length, Angle and Default Size included; Cancel changes nothing. Tests: `toolbar::tests::double_clicking_the_line_arc_and_grid_tools_opens_their_tool_options`, `line_segment_options_and_fill_line`, `grid_default_size_is_an_option_the_drag_leaves_out`, `fill_line_gives_a_new_line_the_current_fill`.
     Live curve fitting in the Pencil Tool Options is on by default; while it is off, the path shown while a stroke is drawn joins the stroke's points with straight segments, and the release fits the curve, as [Pencil Tool Options](https://web.archive.org/web/20261002104400/https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/draw-shapes/pencil-tool-options.html) describes (`path.freehand` `fit`).
     In the Pencil and Paintbrush Tool Options, Edit selected paths within 0 px turns editing off, so a stroke that starts exactly on an end of a selected open path draws a new path; Close paths when ends are within 0 px turns closing off, so a stroke that ends exactly where it started stays open.
+    Before a press that draws a new path, the Pencil cursor shows a small star, as [Draw freeform paths with the Pencil tool](https://web.archive.org/web/20260926095638/https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/draw-shapes/draw-freeform-paths-with-the-pencil-tool.html) describes; over a selected path within Edit selected paths' distance, which the press continues from an end or redraws, the star is not shown ([Reshape paths with the Pencil tool](https://web.archive.org/web/20260106004407/https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/draw-shapes/reshape-paths-with-the-pencil-tool.html)).
     Keep selected in the Pencil and Paintbrush Tool Options is on by default; while it is off, the path a stroke draws or continues is not selected afterwards and the rest of the selection stays as it was (`path.freehand` `keepSelected`).
     Double-clicking the Shape Builder tool opens Shape Builder Tool Options ([Shape Builder tool options](https://web.archive.org/web/20260105172244/https://helpx.adobe.com/illustrator/using/building-new-shapes-using-shape.html)): with Consider Open Filled Paths as Closed off, a filled open path cuts regions as an unfilled one does; Pick Color From Color Swatches fills merged shapes with the current fill, the Left and Right arrow keys step it through the document's color swatches, and Cursor Swatch Preview shows the current fill and the swatches before and after it above the pointer; Selection Straight Line merges what the line from a drag's first point to its last crosses ([Setting Illustrator's Shape Builder Options](https://web.archive.org/web/20260615204453/https://creativepro.com/setting-illustrators-shape-builder-options/)); with Highlight Fill off, merge mode shades no regions (`shapeBuilder.merge` `openFilledAsClosed` and `pickColorFrom`).
     With In Merge Mode, Clicking Stroke Splits the Path on in the same dialog, a click on a stroke in merge mode splits its path into the run of stroke under the pointer and the rest of the path, as the [Shape Builder tool options](https://web.archive.org/web/20260105172244/https://helpx.adobe.com/illustrator/using/building-new-shapes-using-shape.html) page describes; the run goes from the anchor or crossing point before the pointer to the one after it, and the pointer shows scissors over it. Highlight Stroke When Editable draws that run in the color chosen in its Color list (Red by default), and with Pick Color From Color Swatches the run takes the current fill as its stroke (`shapeBuilder.merge` `splitStroke`).