fix(bank_panel): repaint footer mode toggle when Design/Arrange action fires

src/actions.cpp

@@ -251,6 +251,7 @@ void doToggleMode() {
     if (target.empty()) return;  // no modes to cycle to (degenerate)
     applyMode(g_session->view(), target, nullptr);
     persistViewState();
+    bankPanelInvalidate();  // repaint the footer [Arrange|Design] toggle immediately
 }
 
 // Direct jump to a named mode. applyMode is a no-op (returns false, no mutation) if
@@ -258,6 +259,7 @@ void doToggleMode() {
 void doActivateMode(const std::string& modeId) {
     applyMode(g_session->view(), modeId, nullptr);
     persistViewState();
+    bankPanelInvalidate();  // repaint the footer [Arrange|Design] toggle immediately
 }
 
 // Tag the selection's leaves into `modeId`, then reapply so the change is immediate.