Persist engine state in DAW projects, black monochrome panel, expand preset bank

- Save/load the engine's full parameter set alongside the preset index so
  knob and menu tweaks survive relaunching a song project
- Make the plugin panel black: top/surround laser border and bottom deck
  (rotary + nav keys) are now #000000
- Extend factory bank to 320 categorized presets and add LCD click-to-open
  preset category browser

Source/LcdDisplay.h

@@ -16,6 +16,9 @@ public:
     void showCursor (bool show);
     void clear();
     void paint (juce::Graphics&) override;
+    void mouseDown (const juce::MouseEvent&) override;
+
+    std::function<void(int row)> onPressed;
 
 private:
     void timerCallback() override;