Fix: GUI button toggles Open/Close — sends hide_gui when GUI is open, guaranteed to work"

Source/Plugin/PluginBridgeEditor.h

@@ -16,19 +16,20 @@ public:
 private:
     void timerCallback() override;
     void showPluginMenu();
+    void toggleGui();
 
     PluginBridgeProcessor& processorRef;
 
-    // Status indicators
     juce::Label titleLabel;
     juce::Label mcpStatusLabel;
     juce::Label pluginStatusLabel;
     juce::Label connectionLabel;
 
-    // Buttons
     juce::TextButton selectButton{"Select Plugin"};
     juce::TextButton guiButton{"Open GUI"};
     juce::TextButton reloadButton{"Reload"};
 
+    bool guiOpen = false;
+
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginBridgeEditor)
 };