fix: insert onto selected track(s) at edit cursor, not a new track

Wire both insert actions to CurrentTrack (InsertMedia base 0). Per selected
track: SetOnlyTrackSelected, reset cursor to snapshot, InsertMedia; then restore
original selection + cursor. No-op when no track selected. Corrected stale
extraflags / new-track / preservePitch comments.

src/main.cpp

@@ -142,7 +142,8 @@ static void RunCaptureMasterSpike()
 static void RunInsertSelected(bool conform)
 {
     reasampler::InsertRequest req;
-    req.options.target = reasampler::InsertTarget::NewTrack;  // sensible default: own track
+    // target defaults to CurrentTrack (InsertOptions::target) — inserts onto the
+    // user's currently-selected track(s) at the edit cursor.
     req.options.conform =
         conform ? reasampler::TempoConform::Ratio1x : reasampler::TempoConform::None;
     // preservePitch stays true: a tempo conform matches tempo without varispeeding
@@ -154,14 +155,13 @@ static void RunInsertSelected(bool conform)
     switch (res.status)
     {
         case reasampler::InsertStatus::Ok:
-            msg = "ReaSampler: inserted " + std::to_string(res.inserted) +
-                  (res.inserted == 1 ? " sample" : " samples") +
-                  (conform ? " (conformed to tempo)" : " (native length)");
-            if (res.skipped > 0)
-                msg += ", skipped " + std::to_string(res.skipped) + " unresolvable";
-            msg += "\n";
+            msg = "ReaSampler: inserted onto " + std::to_string(res.inserted) +
+                  (res.inserted == 1 ? " track" : " tracks") +
+                  (conform ? " (conformed to tempo)" : " (native length)") + "\n";
             break;
         case reasampler::InsertStatus::NoSelection:
+            // "select a track first" is printed by runInsert when no track is
+            // selected; this branch covers the no-panel-selection case.
             msg = "ReaSampler insert: nothing selected in the bank panel.\n";
             break;
         case reasampler::InsertStatus::NoProject: