Initial commit: InstaDrums VST3 drum sampler plugin

- 12-pad drum sampler with 4x3 grid (expandable by 4)
- Velocity layers with round-robin (Salamander-style filename parsing)
- Rhythm Engine-style GUI: pad grid (left), sample editor (right top),
  FX panel (right bottom), master panel (bottom)
- Waveform thumbnails on pads + large waveform in sample editor
- ADSR envelope, pitch, pan per pad
- Drag & drop sample/folder loading
- Kit save/load (.drumkit XML presets)
- Load Folder with smart name matching (kick, snare, hihat, etc.)
- Choke groups, one-shot/polyphonic mode
- Dark modern LookAndFeel with neon accent colors
- Built with JUCE framework, CMake, MSVC 2022

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Source/MasterPanel.cpp

@@ -0,0 +1,62 @@
+#include "MasterPanel.h"
+#include "LookAndFeel.h"
+
+MasterPanel::MasterPanel()
+{
+    masterTitle.setFont (juce::FontOptions (12.0f, juce::Font::bold));
+    masterTitle.setColour (juce::Label::textColourId, InstaDrumsLookAndFeel::textSecondary);
+    addAndMakeVisible (masterTitle);
+
+    setupKnob (volumeSlider, volumeLabel, "Volume", 0.0, 2.0, 1.0, 0.01);
+    setupKnob (tuneSlider,   tuneLabel,   "Tune",  -12.0, 12.0, 0.0, 0.1);
+    setupKnob (panSlider,    panLabel,    "Pan",    -1.0, 1.0, 0.0, 0.01);
+
+    addAndMakeVisible (vuMeter);
+}
+
+void MasterPanel::setupKnob (juce::Slider& s, juce::Label& l, const juce::String& name,
+                              double min, double max, double val, double step)
+{
+    s.setSliderStyle (juce::Slider::RotaryHorizontalVerticalDrag);
+    s.setTextBoxStyle (juce::Slider::NoTextBox, false, 0, 0);
+    s.setRange (min, max, step);
+    s.setValue (val, juce::dontSendNotification);
+    addAndMakeVisible (s);
+
+    l.setText (name, juce::dontSendNotification);
+    l.setFont (juce::FontOptions (9.0f));
+    l.setColour (juce::Label::textColourId, InstaDrumsLookAndFeel::textSecondary);
+    l.setJustificationType (juce::Justification::centred);
+    addAndMakeVisible (l);
+}
+
+void MasterPanel::paint (juce::Graphics& g)
+{
+    auto bounds = getLocalBounds().toFloat();
+    g.setColour (InstaDrumsLookAndFeel::bgMedium.darker (0.2f));
+    g.fillRoundedRectangle (bounds, 4.0f);
+    g.setColour (InstaDrumsLookAndFeel::bgLight.withAlpha (0.3f));
+    g.drawRoundedRectangle (bounds, 4.0f, 1.0f);
+}
+
+void MasterPanel::resized()
+{
+    auto area = getLocalBounds().reduced (4);
+
+    masterTitle.setBounds (area.removeFromLeft (55).reduced (0, 2));
+
+    // VU meter on the right
+    vuMeter.setBounds (area.removeFromRight (24).reduced (0, 2));
+    area.removeFromRight (4);
+
+    // Knobs
+    int knobW = area.getWidth() / 3;
+    juce::Slider* sliders[] = { &volumeSlider, &tuneSlider, &panSlider };
+    juce::Label*  labels[]  = { &volumeLabel,  &tuneLabel,  &panLabel };
+    for (int i = 0; i < 3; ++i)
+    {
+        auto col = area.removeFromLeft (knobW);
+        labels[i]->setBounds (col.removeFromBottom (12));
+        sliders[i]->setBounds (col);
+    }
+}