Fix drag-out losing audio and FX-container drops losing the capture; re-home ingest under shell/actions

src/core/wire/instrument_drop.cpp

@@ -76,6 +76,17 @@ std::vector<std::uint8_t> buildInstrumentDropPreset(const std::string& sampleId)
     return buildVstPresetBytes(vstClassIdHex(), instrumentDropStateBytes(sampleId));
 }
 
+DropOutcome decideDropOutcome(const DropAttempt& attempt) {
+    DropOutcome out;
+    if (attempt.addedFxIndex < 0) return out;  // add failed — nothing exists to roll back
+    if (!attempt.presetApplied) {
+        out.rollbackFxIndex = attempt.addedFxIndex;
+        return out;
+    }
+    out.loaded = true;
+    return out;
+}
+
 bool infoNamesFxHotspot(const std::string& info) {
     // See the header contract for the prefix rule and the embed-strip exclusion.
     auto startsWith = [&info](const char* p) { return info.rfind(p, 0) == 0; };