Reflow the deck into two categorical rows plus a double-height MASTER bus deck

Row membership is now the group's own property, not a wrap outcome. FILTER's Band|Notch moves to its caption slack, which is what makes the sound row fit. MASTER gains the limiter toggle, the output meter and the GR lamp.

src/shell/instrument/editor_input_deck.cpp

@@ -64,6 +64,18 @@ bool ReaSamplerEditor::mouseDownDeck(const FaceLayout& fl, int x, int y) {
                 applyParamControl(hit.id, 0.0, hit.segment);
                 commitAndReload();
                 break;
+            case ParamControl::kLimiterEnable: {
+                const bool on = (hit.segment == 1);
+                if (on != params_.limiterEnabled) {
+                    params_.limiterEnabled = on;
+                    // The processor's own funnel mirrors the audio-thread flag and requests the
+                    // host's latency restart; a reload would re-decode a WAV the toggle cannot
+                    // change. The local snapshot moves with it so a later commit agrees.
+                    processor_->setLimiterEnabled(on);
+                }
+                invalidate();
+                break;
+            }
             default: {
                 // Parameter-set toggles (play mode / pitch engine / pitch-env + filter enable,
                 // and the three env-mode toggles).
@@ -80,6 +92,14 @@ bool ReaSamplerEditor::mouseDownDeck(const FaceLayout& fl, int x, int y) {
         }
         return true;
     }
+    if (hit.kind == DeckHitKind::Column) {
+        // The meter's ONLY gesture: clear the latched clip cap. Both latches go — the audio
+        // thread's is what the next tick would otherwise re-latch the UI's from.
+        masterMeter_ = clearMasterMeterClip(masterMeter_);
+        processor_->clearMasterBusClip();
+        invalidate();
+        return true;
+    }
     if (hit.kind == DeckHitKind::Knob) {
         // Knobs of a disabled group are drawn but inert.
         if (deckKnobDisabled(hit.id)) return true;
@@ -179,6 +199,9 @@ ReaSamplerEditor::HoverTarget ReaSamplerEditor::hoverDeck(const FaceLayout& fl,
     const DeckLayout dl = layoutDeck(fl.deckDescs, band.x, band.y, band.width);
     const DeckHit dh = hitTestDeck(dl, x, y);
     if (dh.kind == DeckHitKind::None) return {};
+    // The meter reports its own state continuously; a hover on it would only mean "the clip
+    // cap is clearable", which the cap's presence already says.
+    if (dh.kind == DeckHitKind::Column) return {};
     if (dh.kind == DeckHitKind::CaptionRadio) return {HoverKind::kEnvRadio, dh.id};
     if (dh.kind == DeckHitKind::Knob && dh.inner &&
         curveParamFor(static_cast<ParamControl>(dh.id)) != ParamControl::kCount) {