Handle missing viewState gracefully in SurfaceMountingManager.updateState and updatePadding (#57181)

Summary:

## Summary

Fixes `RetryableMountingLayerException: Unable to find viewState for tag N. Surface stopped: false` crashing `com.oculus.firsttimenux` from the Fabric batch-mount path.

Logview link: [252c85116a7ab5c4ec93ef3c3373cf9d](https://www.internalfb.com/logview/system_vros_crashes/252c85116a7ab5c4ec93ef3c3373cf9d)

## Root cause

`IntBufferBatchMountItem.execute` dispatches batched mount instructions. When a view tag is transiently missing from the registry (async race between the JS commit and native mount — surface teardown / out-of-order delivery), mount methods that call the throwing `getViewState` raise `RetryableMountingLayerException`. `MountItemDispatcher.dispatchMountItems` only retries this exception `if (item is DispatchCommandMountItem)` (comment: *"Only DispatchCommandMountItem supports retries"*) — `IntBufferBatchMountItem` is not one, so the "retryable" exception propagates uncaught and crashes the app.

The RN team has been hardening each batch mount method to handle missing viewState gracefully (soft-log + early return): `addViewAt` in `D99760257` (which references this same MID and process), `updateOverflowInset` in `D104400233`; `removeViewAt`, `updateProps`, `updateLayout`, and `deleteView` were already graceful. The originally-reported `addViewAt` stack is therefore already fixed in trunk — crashes persist on release branch v201/v203 which predates `D99760257`.

`updateState` (`INSTRUCTION_UPDATE_STATE`) and `updatePadding` (`INSTRUCTION_UPDATE_PADDING`) were the two remaining throwing `getViewState` callers reachable from `IntBufferBatchMountItem.execute` — unfixed siblings of the same multi-site pattern and live/contributing crash sites for the same exception.

## Fix

Change `updateState` and `updatePadding` to use `getNullableViewState`; on null, log a `SURFACE_MOUNTING_MANAGER_MISSING_VIEWSTATE` soft exception and return early — identical to the established pattern in `addViewAt`, `updateOverflowInset`, `updateProps`, `updateLayout`, and `deleteView`. This is not a throw-downgrade of an invariant: `RetryableMountingLayerException` is an explicitly retryable transient signal, and this matches the canonical handling the RN team applies to every other batch mount method.

The non-batch callers (`sendAccessibilityEvent`, `setJSResponder`) are intentionally left unchanged — `sendAccessibilityEvent` is already protected by its own `try/catch (RetryableMountingLayerException)` in `SendAccessibilityEventMountItem.execute`.

## Changelog:

[Android] [Fixed] - Handle missing viewState gracefully in `SurfaceMountingManager.updateState` and `updatePadding` to avoid `RetryableMountingLayerException` crashes from the Fabric batch-mount path

Reviewed By: javache

Differential Revision: D107768754

Author: shubhamksavita

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/SurfaceMountingManager.kt

@@ -873,7 +873,14 @@ internal constructor(
       return
     }
 
-    val viewState = getViewState(reactTag)
+    val viewState = getNullableViewState(reactTag)
+    if (viewState == null) {
+      ReactSoftExceptionLogger.logSoftException(
+          ReactSoftExceptionLogger.Categories.SURFACE_MOUNTING_MANAGER_MISSING_VIEWSTATE,
+          ReactNoCrashSoftException("Unable to find viewState for tag $reactTag for updatePadding"),
+      )
+      return
+    }
     // Do not layout Root Views
     if (viewState.isRoot) {
       return
@@ -934,7 +941,14 @@ internal constructor(
       return
     }
 
-    val viewState = getViewState(reactTag)
+    val viewState = getNullableViewState(reactTag)
+    if (viewState == null) {
+      ReactSoftExceptionLogger.logSoftException(
+          ReactSoftExceptionLogger.Categories.SURFACE_MOUNTING_MANAGER_MISSING_VIEWSTATE,
+          ReactNoCrashSoftException("Unable to find viewState for tag $reactTag for updateState"),
+      )
+      return
+    }
 
     val prevStateWrapper = viewState.stateWrapper
     viewState.stateWrapper = stateWrapper