Move export snapshot platform support to app core

src/app_core/document_export.h

@@ -489,6 +489,15 @@ public:
     return false;
 }
 
+[[nodiscard]] constexpr bool document_export_snapshot_platform_supported() noexcept
+{
+#if __WEB__
+    return false;
+#else
+    return true;
+#endif
+}
+
 [[nodiscard]] constexpr DocumentExportSnapshotRoutePlan plan_document_export_snapshot_route(
     DocumentExportExecutionKind kind,
     DocumentCanvasSaveSnapshotReport report,
@@ -534,6 +543,18 @@ public:
         platform_supported);
 }
 
+[[nodiscard]] constexpr DocumentExportSnapshotRoutePlan plan_document_export_snapshot_route_for_current_platform(
+    DocumentExportExecutionKind kind,
+    DocumentCanvasSaveSnapshotReport report,
+    std::string_view target_path = {}) noexcept
+{
+    return plan_document_export_snapshot_route_for_target(
+        kind,
+        report,
+        target_path,
+        document_export_snapshot_platform_supported());
+}
+
 [[nodiscard]] constexpr DocumentExportCollectionTargetPlan plan_document_export_collection_target(
     DocumentExportCollectionKind kind,
     bool use_work_directory_collection) noexcept