feat: fix heatmap false-heat on offset shift, hover flicker, type chooser cleanup

- Clear value history when node offsets change (insert/delete/resize/
  manual offset edit) so stale values from old addresses don't show
  false heat coloring
- Invalidate in-flight async reads (bump refreshGen) when tree layout
  changes, preventing stale snapshot data from re-introducing heat
- Fix command bar hover cursor flicker: remove premature
  applyHoverCursor() from applyDocument() — runs correctly via
  applySelectionOverlays() after text is finalized
- Fix hover indicator survival: reorder refresh() so text-modifying
  passes (updateCommandRow) run before overlay passes
- Guard synthetic Leave events during setText() to preserve hover state
- Remove primitives from type chooser when pointer modifier (* / **)
  is active; remove primitives entirely in Root command bar mode
- Add test_editor and test_controller test coverage for heat clearing,
  hover survival, and mixed hex/non-hex type scenarios

src/optionsdialog.h

@@ -6,6 +6,7 @@
 #include <QComboBox>
 #include <QCheckBox>
 #include <QHash>
+#include <QSpinBox>
 
 namespace rcx {
 
@@ -16,6 +17,7 @@ struct OptionsResult {
     bool    showIcon = false;
     bool    safeMode = false;
     bool    autoStartMcp = false;
+    int     refreshMs = 660;
 };
 
 class OptionsDialog : public QDialog {
@@ -38,6 +40,7 @@ private:
     QCheckBox*      m_showIconCheck  = nullptr;
     QCheckBox*      m_safeModeCheck  = nullptr;
     QCheckBox*      m_autoMcpCheck   = nullptr;
+    QSpinBox*       m_refreshSpin    = nullptr;
 
     // searchable keywords per leaf tree item
     QHash<QTreeWidgetItem*, QStringList> m_pageKeywords;