view: split the deferred FX-park drain by kind — restores stay forced, parks go one FX per idle tick behind a 1s coalescing delay

A rapid A→B→A flip now costs no plugin work: the restore cancels the still-pending
park outright. A park that has already written one FX carries a `partial` flag and is
superseded by its inverse rather than cancelled, so a half-parked chain is never stranded.

src/shell/capture/render_in_place.cpp

@@ -22,7 +22,7 @@
 #include "shell/panel/panel_input.h"             // bankPanelTailSetting
 #include "shell/persist/session.h"
 #include "shell/view/view.h"                     // applyMode / mintManagedLanes
-#include "shell/view/view_fx_park.h"             // drainDeferredFxParks
+#include "shell/view/view_fx_park.h"             // drainDeferredFxRestores
 
 #define REAPERAPI_MINIMAL
 #define REAPERAPI_WANT_CountTrackMediaItems
@@ -211,7 +211,7 @@ void RunRenderTrackInPlace(ReaSamplerSession& session) {
     // Persist outside the block. The offline render's own save gate already forced a
     // saved project, so the Save-As-guarded persist the Design View actions need
     // cannot have anything to prompt for here.
-    drainDeferredFxParks();  // the reapply above may have deferred a restore — see the contract there
+    drainDeferredFxRestores();  // the reapply above may have deferred a restore — contract there
     session.saveToActiveProject();
 
     if (!placed) {