Sketch: lines snap to horizontal/vertical near the axes (with an H/V marker; the constraint is inferred), inline dimension boxes sit beside what they measure instead of on it; Esc acts once per press (ends the line chain first, then the tool)

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

crates/ui-egui/src/dialogs.rs

@@ -1179,7 +1179,8 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
     if enter_applies && (enter || canvas_enter || (enter_free && nothing_focused)) {
         ok = true;
     }
-    if esc {
+    if esc && !app.esc_handled {
+        app.esc_handled = true;
         cancel = true;
     }
     // A plane picked for a new sketch starts it right away.