fix(Android, Stack v4): Fix crash when a Screen is reordered inside ScreenStack

[t0maboro]

Description

Fabric treats a screen move as a pair of Remove and Insert mutations in a single transaction. Our removal-detection paths could not detect a move to another parent and starts removal transition unconditionally, marking the whole subtree of a screen that stays alive with startViewTransition. ViewGroup does not clear mParent for views in mTransitioningViews, so when the same commit also reorders children inside the moved screen, their Remove leaves mParent set and then Insert of the same view instance throws.

Proposing a simple mechanism for detecting when the Screen moves to another parent, and in that case, removing it immediately from the current parent.

Changes

• detected Remove+Insert of the same tag is a move, which shouldn't notify the removal path

Before & after - visual documentation

Before	After
Screen.Recording.2026-08-12.at.15.09.04.mov	Screen.Recording.2026-08-12.at.15.07.31.mov

Test plan

Added dedicated test

Checklist

• Included code example that can be used to test this change.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• For API changes, updated relevant public types.
• Ensured that CI passes

[Copilot]

Pull request overview

Fixes an Android Stack v4 crash caused by Fabric screen reordering.

Changes:

• Detects screen moves within mounting transactions.
• Detaches moved screens without starting removal transitions.
• Adds a manual regression reproducer.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
cpp/legacy/RNSScreenRemovalListener.cpp	Distinguishes moves from removals.
android/.../ScreenStackViewManager.kt	Immediately detaches moved screens.
apps/src/tests/issue-tests/TestXXXX.tsx	Reproduces concurrent screen and child reordering.
apps/src/tests/issue-tests/index.ts	Registers the reproducer.

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