Merge pull request #6926 from dotCooCoo/feat/recent-colors-to-swatches

Color: a recent color drags into the Swatches panel to become a swatch

docs/target-app-parity.md

@@ -1335,6 +1335,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     Plain Comma and Period, and also Shift+Comma and Shift+Period, apply the last solid color and the last gradient to the active Fill or Stroke proxy in VectorCraft ([Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html), "Select color fill mode" and "Select gradient fill mode").
     Recent Colors keeps the last 30 solid colors applied, newest first and each once, and the list stays the same when another document is opened or made active; a 31st color drops the oldest ([Select colors using the Color panel](https://helpx.adobe.com/illustrator/desktop/manage-colors/select-and-adjust-colors/select-colors-using-the-color-panel.html)). The list lasts for the session. In the Color and Swatches panels the chips wrap onto further rows when the panel is too narrow for one row (`paint.recent`). Tests: `recent_colors_keep_thirty_colors_across_documents` in `crates/engine/src/tests/paintproxy.rs`, `all_thirty_recent_colors_wrap_into_a_narrow_panel` in `crates/ui-egui/src/panels/color/tests.rs`.
     Unchecking Show Recent Colors in the Color panel's menu hides its Recent Colors row, and checking it shows the row again ([Select colors using the Color panel](https://helpx.adobe.com/illustrator/desktop/manage-colors/select-and-adjust-colors/select-colors-using-the-color-panel.html)). In VectorCraft the item is checked by default and kept between sessions, applied colors still join the list while the row is hidden, Hide Options hides the row either way, and the Swatches panel keeps its row (`ui.colorPanel {recentColors}`). Tests: `show_recent_colors_hides_and_shows_the_row` in `crates/ui-egui/src/panels/color/tests.rs`.
+    A Recent Colors chip in the Color or Swatches panel drags into the Swatches panel's list to become a swatch of its color, in its color model, as one undo step ([Select colors using the Color panel](https://helpx.adobe.com/illustrator/desktop/manage-colors/select-and-adjust-colors/select-colors-using-the-color-panel.html)). In VectorCraft a chip dropped on a color group or one of its swatches joins that group, anywhere else in the list it joins the ungrouped swatches at the end, a color that is already a swatch is added again under another name, and dragging a chip does not paint the selected art (`swatch.new`). Tests: `a_recent_color_dragged_onto_the_list_becomes_a_swatch` and `a_recent_color_dragged_from_the_color_panel_becomes_a_swatch` in `crates/ui-egui/src/panels/swatches/tests.rs`.
     A Cmd/Ctrl-click on the Color panel's spectrum applies Complement and a Cmd/Ctrl+Shift-click applies Invert to the active Fill or Stroke (`paint.complement`, `paint.invert`); with Alt also held, the click recolors the inactive one, as the reference app's [Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) list them.
     View › Proof Setup › Color blindness – Tritanopia-type turns Proof Colors on and proofs the canvas with the tritanopia simulation of Brettel, Viénot and Mollon (1997). The Separations Preview panel's Proof Setup list offers the same target (`view.proofSetup {target: "tritanopia"}`). Grays keep their value.
     The Separations Preview panel's Gamut Check button reports one color outside the CMYK gamut in the singular and more in the plural, in English and in each language's plural forms (`gamut_check_status_takes_the_plural_form` in `crates/ui-egui/src/i18n/tests.rs`).