Design: a sketch takes its floating chrome with it when it ends

Confirming a sketch while an inline value field was open left the field behind. The
editor is a top-level frame, so it survived the session that owned it, and inline_busy
stayed set with it — on_mouse_impl then returned true at its first branch for every
later click and the viewport was simply dead. No refusal, no message: exactly the
"click the geometry, nothing happens" the pick bugs above it were mistaken for.

finish() and cancel() now call close_session_chrome(): dismiss the open field
(keep-as-drawn, the same contract the polyline terminators already use), drop the
queue of fields behind it, and clear the corner readout — which had the same defect
for the same reason, sitting on 336.8° over a committed sketch because nothing redraws
the HUD once the tool stops.

Verified on the rig on the exact reported sequence: line on XZ, Return to accept the
length, Confirm with the Angle field still open. The field goes, the sketch commits,
and the next click reaches the pick (pick trace shows down/up consumed) and selects
Sketch1.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyRwbuq6fjn3VV9U9UvhBM

src/slic3r/GUI/DesignSketchTool.hpp

@@ -357,6 +357,16 @@ public:
         m_autoedit_seen    = int(m_entities.size());
         m_live_quotes.clear();   // rebuilt from current geometry on the next render
     }
+    // Take down the session's floating chrome: the open value field (dismiss = keep-as-drawn),
+    // the queue of fields behind it, and the corner readout. All three are top-level windows fed
+    // only while the tool is live, so nothing else would ever clear them — reset_autoedit() alone
+    // clears the flag and leaves the frame on screen. Called by finish()/cancel(); safe when
+    // nothing is open.
+    void close_session_chrome() {
+        if (on_inline_dismiss) on_inline_dismiss();   // no-op when no field is open
+        reset_autoedit();
+        if (on_readout) on_readout(std::string());    // the HUD is not redrawn once the tool stops
+    }
     // Ctrl+Z while sketching: drop the last drawn entity (reuses delete_selected's remap).
     bool undo_last_entity() {
         if (!m_active || m_entities.empty()) return false;