React dispatcher freeze mechanism

[aidenybai]

Add freeze and isFreezeActive functions to block React state updates.

Initial attempts to freeze updates by patching dispatchers were insufficient because React components capture their dispatch functions during the initial render, making them referentially stable. The revised implementation intercepts updates at the queue.pending level within each hook's queue, preventing updates from being enqueued. It also patches dispatchers to ensure new components mounted while frozen also respect the freeze.

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Project	Deployment	Review	Updated (UTC)
bippy	Ready	Preview, Comment	Jan 4, 2026 1:53am

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commit: 5dff70b