Carry the level everywhere a position is drawn, and gate it per occurrence

frontend/src/views/MapView.vue

@@ -289,7 +289,12 @@ async function exportPdf() {
   try {
     await loadMapConfig()
     await exportMapPdf({
-      assets: filteredAssets.value,
+      // Only this level's markers. The sheet is one drawing, so a marker
+      // positioned against another level would be printed on the wrong floor
+      // plan - the same failure the on-screen map had, in a form nobody can
+      // correct after it is printed and carried onto the floor.
+      assets: filteredAssets.value.filter(
+        asset => (asset.levelid ?? null) === shownLevelId.value),
       // blueprintUrlFor applies withBase - the raw setting value is a
       // root-relative /api path, which 404s under a subpath mount like /ops.
       // The PDF always uses the light blueprint: it prints on white paper.