Close the collapse's two dropped guarantees: latch applyMode against re-entrancy, pin its project once; correct three overclaiming doc lines

src/shell/view/view_fx_park.cpp

@@ -206,10 +206,11 @@ TrackApplyResult restoreTrack(ViewModeModel& model, const std::string& guid, Med
 
     if (applyFlags(tr, flags, out.fxMoved)) out.wrote = true;
 
-    // Unconditional, even when every write above was elided: the snapshot is
-    // gone, so this apply is not repeatable and must not close on the discard
-    // form. Model state, not project state — whether an undo actually puts the
-    // snapshot back is the ext-state question in src/shell/view/CLAUDE.md.
+    // Unconditional, even when every write above was elided: the snapshot is consumed
+    // here, so this apply changed state and is not repeatable — and `wrote`, whose one
+    // reader asks exactly that, would be a lie at false. NOT a claim about what the
+    // undo record holds: the block never carries the snapshot either way, that being
+    // model state persisted after Undo_EndBlock2 (src/shell/view/CLAUDE.md).
     model.clearSnapshot(guid);
     out.wrote = true;
     return out;