🤖 perf: reduce ChatInput rerenders during streaming

[ammar-agent]

Generated with mux

What

Reduce ChatInput re-renders during streaming by:

• adding an explicit React.memo boundary for ChatInput
• stabilizing AIView → ChatInput props (memoized auto-compaction result, stable review callbacks)
• removing handler churn tied to streaming updates by reading latest workspace state via a ref

How to verify

• Start a long streaming response and profile renders: ChatInput should no longer commit on each delta.