[0.84] Fix crash in tracking spring animations when toValue node is detached

[kmsbernard]

Target Branch

0.84

Link to commit or PR to be picked

facebook/react-native@45de710

Description

This fixes an Android Native Animated crash in a core animation path.
During teardown (unmount/re-render/navigation), a tracked toValue node can be detached and RN may pass toValue = null into spring config, causing NullPointerException.

This change prevents null propagation and adds a regression test. It is a single, low-risk fix with no reliable app-level workaround.

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