v1.1 — Improved metering, transformer, and optical cell tuning

- Needle VU meters with spring-mass-damper physics (analog inertia)
- Swappable meter modes: GR needles + input bars, or input needles + GR bars
- GR bar meters fill right-to-left (0dB=empty, -30dB=full)
- Input bar meters fill left-to-right with green color
- Optical cell: normalized parameters (eta=50) for proper audio-level response
- Transformer: removed 3-band crossover artifacts, simplified waveshaping with dry/wet mix
- Nickel/Iron/Steel with distinct but subtle harmonic character
- Layout: optical left, discrete right, meters center, transformer+output bottom center

Source/CompressorEngine.cpp

@@ -34,6 +34,13 @@ void CompressorEngine::processBlock (juce::AudioBuffer<float>& buffer)
 
     if (globalBypass.load() || numChannels == 0) return;
 
+    // Measure input level BEFORE any processing
+    inputLevelL.store (buffer.getMagnitude (0, 0, numSamples));
+    if (numChannels > 1)
+        inputLevelR.store (buffer.getMagnitude (1, 0, numSamples));
+    else
+        inputLevelR.store (inputLevelL.load());
+
     // Read parameters once per block
     float optoThresh = optoThresholdDb.load();
     float optoGain   = optoGainDb.load();