Fix Insert-as-FX review findings: id rename, selection-count drift, refusal tooltip, success msg, master-only, reserve test

Renames the permanent action id out of the placement family, makes the button's
painted state and pressed outcome share one selection count, surfaces
panel-known refusals in the tooltip, reports the target track on success,
distinguishes a master-only selection, and pins the overflow-reserve test to the
real bar spec.

src/shell/actions/insert_fx_action.cpp

@@ -16,6 +16,9 @@
 
 #define REAPERAPI_MINIMAL
 #define REAPERAPI_WANT_GetSelectedTrack
+#define REAPERAPI_WANT_GetMasterTrack
+#define REAPERAPI_WANT_GetMediaTrackInfo_Value
+#define REAPERAPI_WANT_GetTrackName
 #define REAPERAPI_WANT_ShowConsoleMsg
 #include "reaper_plugin_functions.h"
 
@@ -27,6 +30,23 @@ void report(const std::string& sentence) {
     if (ShowConsoleMsg) ShowConsoleMsg(("ReaSampler: " + sentence + "\n").c_str());
 }
 
+// GetSelectedTrack ignores the master, so a master-only selection reads back as "no
+// track" -- distinguish it here for a clearer refusal (core/ui/insert_fx_enable.h).
+bool isMasterOnlySelected() {
+    if (!GetMasterTrack || !GetMediaTrackInfo_Value) return false;
+    MediaTrack* master = GetMasterTrack(nullptr);
+    return master && GetMediaTrackInfo_Value(master, "I_SELECTED") != 0.0;
+}
+
+// "Track N" for an unnamed track, matching REAPER's own convention (GetTrackName,
+// not P_NAME, for the same reason scope_resolve::trackName picks it).
+std::string trackDisplayName(MediaTrack* tr) {
+    std::vector<char> buf(256, '\0');
+    if (GetTrackName && GetTrackName(tr, buf.data(), static_cast<int>(buf.size())))
+        return std::string(buf.data());
+    return "the selected track";
+}
+
 }  // namespace
 
 void doInsertAsFx() {
@@ -37,7 +57,8 @@ void doInsertAsFx() {
     MediaTrack* track = GetSelectedTrack ? GetSelectedTrack(nullptr, 0) : nullptr;
 
     const ui::InsertFxRefusal refusal =
-        ui::insertFxRefusal(static_cast<int>(selected.size()), track != nullptr);
+        ui::insertFxRefusal(static_cast<int>(selected.size()), track != nullptr,
+                            !track && isMasterOnlySelected());
     if (refusal != ui::InsertFxRefusal::None) {
         report(ui::insertFxRefusalMessage(refusal));
         return;
@@ -49,6 +70,9 @@ void doInsertAsFx() {
     if (!performInstrumentDrop(track, wire::buildInstrumentDropPreset(selected.front())))
         report("could not add ReaSampler 9000 to the selected track -- check the plug-in "
                "is installed and scanned");
+    else
+        report("added ReaSampler 9000 to \"" + trackDisplayName(track) +
+               "\", loaded with the selected capture");
 }
 
 }  // namespace reasampler