Sprint 1: Add PluginBridgeEditor.h/.cpp — minimal status GUI

Source/PluginBridgeEditor.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <juce_gui_basics/juce_gui_basics.h>
+#include "PluginBridgeProcessor.h"
+
+class PluginBridgeEditor : public juce::AudioProcessorEditor,
+                            private juce::Timer
+{
+public:
+    explicit PluginBridgeEditor(PluginBridgeProcessor&);
+    ~PluginBridgeEditor() override;
+
+    void paint(juce::Graphics&) override;
+    void resized() override;
+
+private:
+    void timerCallback() override;
+
+    PluginBridgeProcessor& processorRef;
+    juce::Label titleLabel;
+    juce::Label statusLabel;
+    juce::Label portLabel;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginBridgeEditor)
+};