feat: legible ReaSampler 9000 editor — bigger knobs, ms time constants, per-ring double-click reset, and an antialiased draw pass

src/shell/instrument/editor_input_deck.cpp

@@ -108,6 +108,43 @@ bool ReaSamplerEditor::mouseDownDeck(const FaceLayout& fl, int x, int y) {
     return true;
 }
 
+bool ReaSamplerEditor::doubleClickDeck(const FaceLayout& fl, int x, int y) {
+    const Rect& band = fl.bands.decks;
+    if (!contains(band, x, y)) return false;
+    const DeckLayout dl = layoutDeck(fl.deckDescs, band.x, band.y, band.width);
+    // Resolved against the drawn CIRCLES (hitTestKnobFace), not the cell a drag grabs anywhere
+    // in: the two rings are concentric, so only a radial resolve can tell "reset the exponent"
+    // from "reset the value".
+    const DeckFaceHit hit = hitTestKnobFace(dl, x, y);
+    if (hit.id < 0) return false;
+    if (deckKnobDisabled(hit.id)) return true;  // drawn-but-dead: swallow, change nothing
+    // A VELOCITY cell is a popup opener with no scalar value to reset.
+    if (curveTargetFor(hit.id) != CurveTarget::kNone) return true;
+
+    const ParamControl curve = curveParamFor(static_cast<ParamControl>(hit.id));
+    const bool inner = hit.inner && curve != ParamControl::kCount;
+    const int target = inner ? static_cast<int>(curve) : hit.id;
+    // The processor-side knobs own their own defaults — they never reach the parameter set.
+    if (target == static_cast<int>(ParamControl::kVoiceCount)) {
+        voiceCount_ = kDefaultVoiceCount;
+        processor_->setVoiceCount(voiceCount_);
+        invalidate();
+        return true;
+    }
+    if (target == static_cast<int>(ParamControl::kMasterGain)) {
+        processor_->setMasterGainLinear(1.0);
+        invalidate();
+        return true;
+    }
+    resetParamControl(target);
+    // Same commit tiering a drag of this control takes, so a reset reaches the sounding note
+    // exactly as a drag to the same value would.
+    if (dragCommitsLive(DragKind::kDeckKnob, target)) commitLive();
+    else commitAndReload();
+    invalidate();
+    return true;
+}
+
 void ReaSamplerEditor::dragDeck(int x, int y) {
     // Radial knob: grab-anchored vertical drag — knobDragValue maps the y delta from the
     // value at grab (up = increase), so the value tracks relative motion and never jumps on