X and the toolbar's Construction no longer start a pick tool (Fusion has none): with a selection they convert it, with nothing selected they switch construction mode, outside a sketch they say so. Center Rectangle draws both diagonals as construction, the centre at their crossing, with only the first carrying the midpoint constraint (the second is implied), so a fresh one stays at 4 DOF. Scenarios s30 (pattern a hole) and s32 (cut in the active component) enabled now that b36b332 is on main

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

crates/ui-egui/src/sketch_palette.rs

@@ -75,7 +75,9 @@ pub fn set_mode(app: &mut SolveApp, m: u8) {
 /// switch construction mode on or off.
 pub fn toggle_construction(app: &mut SolveApp) {
     let curves = selected_curves(app);
-    if curves.is_empty() {
+    if curves.is_empty() && app.session.active_sketch.is_none() {
+        app.set_status("Construction mode is for drawing in a sketch: edit a sketch first", false);
+    } else if curves.is_empty() {
         let m = if mode(app) == 1 { 0 } else { 1 };
         set_mode(app, m);
     } else {