Seal renderer View public boundary

Summary:
Reclassify the CSS-dependent View conversion headers as private implementation details:

- `BackgroundImagePropsConversions.h`
- `BoxShadowPropsConversions.h`
- `CSSConversions.h`
- `FilterPropsConversions.h`
- `propsConversions.h`

These headers now use the private guard and are removed from the `<React/View.h>` umbrella, along with `conversions.h`. The public `accessibilityPropsConversions.h` stays in the umbrella: it is CSS-free, and framework-tier headers such as the attributed string conversions reach the accessibility role parsers through it. `LayoutConformanceProps.h` now includes the public `conversions.h` and core `propsConversions.h` instead of the private View `propsConversions.h`, so the umbrella stays self-contained under the strict API.

Following the Graphics module, renderer CSS becomes an implementation dependency of View in Buck instead of an exported one. Header publishing in Buck, CocoaPods, SwiftPM, and Gradle prefab is unchanged, consistent with other private headers, and the C++ API snapshots are unchanged.

Changelog: [Internal]

Differential Revision: D119970889

Author: Dawid Małecki

packages/react-native/ReactCommon/react/renderer/components/view/BackgroundImagePropsConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <react/featureflags/ReactNativePublicFeatureFlags.h>
 #include <react/renderer/core/PropsParserContext.h>

packages/react-native/ReactCommon/react/renderer/components/view/BoxShadowPropsConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/RawValue.h>

packages/react-native/ReactCommon/react/renderer/components/view/CSSConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/RawValue.h>

packages/react-native/ReactCommon/react/renderer/components/view/FilterPropsConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/RawValue.h>

packages/react-native/ReactCommon/react/renderer/components/view/LayoutConformanceProps.h

@@ -10,7 +10,8 @@
 #include <react/cxxstableapi/UmbrellaGuard.h>
 
 #include <react/renderer/components/view/YogaStylableProps.h>
-#include <react/renderer/components/view/propsConversions.h>
+#include <react/renderer/components/view/conversions.h>
+#include <react/renderer/core/propsConversions.h>
 
 namespace facebook::react {
 

packages/react-native/ReactCommon/react/renderer/components/view/React/View.h

@@ -33,14 +33,10 @@
 
 #include <react/renderer/components/view/AccessibilityPrimitives.h>
 #include <react/renderer/components/view/AccessibilityProps.h>
-#include <react/renderer/components/view/BackgroundImagePropsConversions.h>
 #include <react/renderer/components/view/BaseTouch.h>
 #include <react/renderer/components/view/BaseViewEventEmitter.h>
 #include <react/renderer/components/view/BaseViewProps.h>
-#include <react/renderer/components/view/BoxShadowPropsConversions.h>
-#include <react/renderer/components/view/CSSConversions.h>
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
-#include <react/renderer/components/view/FilterPropsConversions.h>
 #include <react/renderer/components/view/HostPlatformTouch.h>
 #include <react/renderer/components/view/HostPlatformViewEventEmitter.h>
 #include <react/renderer/components/view/HostPlatformViewProps.h>
@@ -60,9 +56,7 @@
 #include <react/renderer/components/view/YogaLayoutableShadowNode.h>
 #include <react/renderer/components/view/YogaStylableProps.h>
 #include <react/renderer/components/view/accessibilityPropsConversions.h>
-#include <react/renderer/components/view/conversions.h>
 #include <react/renderer/components/view/primitives.h>
-#include <react/renderer/components/view/propsConversions.h>
 
 #undef RN_UMBRELLA_CONTEXT
 #pragma pop_macro("RN_UMBRELLA_CONTEXT")

packages/react-native/ReactCommon/react/renderer/components/view/propsConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/UmbrellaGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <react/renderer/components/view/conversions.h>
 #include <react/renderer/core/PropsParserContext.h>