Fix: sketch edit exit (double-click a sketch no longer traps you)

Edit Sketch rolls the timeline back to just after the sketch and faces it;
Finish Sketch, Esc (once nothing else is left to cancel) and editing another
feature all leave it, restoring the marker and the previous view. Editing the
open sketch again is a no-op and editing another sketch switches cleanly.
The control channel's ui.click takes double: true.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/ui-egui/src/toolbar.rs

@@ -378,8 +378,11 @@ pub fn shortcuts(app: &mut SolveApp, ctx: &egui::Context) {
                     crate::tools::finish(app);
                 } else if app.dialog.is_some() {
                     crate::dialogs::cancel(app);
-                } else {
+                } else if !app.session.selection.is_empty() || app.session.active_sketch.is_none() {
                     let _ = app.run("select.clear", json!({}));
+                } else {
+                    // Nothing left to cancel: Esc finishes the sketch.
+                    app.finish_sketch();
                 }
             }
             Key::S => app.ui.palette_open = true,