fix(vst): declick rev 2 — difference-seeded ungated takeover ramp (rev-1 (1-amp) gate zeroed it on Trigger/zero-attack); preview card opt-in

src/vst/reasampler_processor.h

@@ -52,11 +52,11 @@ struct LoadedInstrument {
     PreviewCard preview;  // Phase S: the isolated preview voice — never part of the pool
     std::uint64_t installedAt = 0;  // reload generation at which this was installed
 
-    // The takeover declick (GA fix) is opted IN here — the PRODUCT default: any restart of a
-    // sounding voice (mono Retrigger takeover/fallback, cross-sample legato restart, POLY
-    // at-cap steal) fades the cut tone over a few ms instead of clicking. The pure core
-    // defaults it off (regression baseline) — same layering as the kDefaultPitchEngine
-    // product default.
+    // The takeover declick (GA fix, rev 2) is opted IN here — the PRODUCT default: any
+    // restart of a sounding voice (mono Retrigger takeover/fallback, cross-sample legato
+    // restart, POLY at-cap steal, AND the preview card's replace-restart) smooths the cut
+    // via the difference-seeded ramp instead of clicking. The pure core defaults it off
+    // (regression baseline) — same layering as the kDefaultPitchEngine product default.
     LoadedInstrument(Keymap km, std::size_t maxVoices,
                      std::uint64_t gen, std::size_t preserveVoiceCap = 0,
                      std::int64_t preserveWindowFrames = 0,
@@ -65,7 +65,7 @@ struct LoadedInstrument {
         : keymap(std::move(km)),
           engine(maxVoices, keymap, preserveVoiceCap, preserveWindowFrames,
                  voiceMode, monoTrigger, /*takeoverDeclick=*/true),
-          preview(keymap, preserveWindowFrames),
+          preview(keymap, preserveWindowFrames, /*takeoverDeclick=*/true),
           installedAt(gen) {}
 
     // True when nothing in this snapshot is sounding — engine voices AND the preview card.