feat(ui): Select Other — pick what lies under something else (#503)

Hold the left button still (long-press on touch) or right-click › Select Other… to list everything under the cursor: sketch points and curves ("Line 3", "Point (arc 2 centre)"), vertices, edges, faces, bodies, profiles, planes and axes, filtered like a click and by the open dialog's active input. Hovering a row lights it up; clicking selects it (Shift/Ctrl add) or feeds the dialog. A repeat click on the same spot with nothing changed selects the next thing there; a double-click keeps its own actions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/toolbar.rs

@@ -1045,7 +1045,9 @@ pub fn shortcuts(app: &mut SolveApp, ctx: &egui::Context) {
         match k {
             Key::Escape => {
                 app.esc_handled = true;
-                if app.tool.is_some() {
+                if crate::select_other::is_open(app) {
+                    crate::select_other::close(app);
+                } else if app.tool.is_some() {
                     crate::tools::finish(app);
                 } else if app.dialog.is_some() {
                     crate::dialogs::cancel(app);