Fix flicker on first chat input change

[AssociationForComputingMachinery-VIT]

Bug

On the first change to the chat input, the chat window flickers or appears to re-render for about one second. The issue does not recur on subsequent input changes.

Steps to reproduce

1. Open the chat window.
2. Change the chat input for the first time.
3. Observe the chat window.

Actual behavior

The chat window flickers or re-renders for approximately one second on the first input change.

Expected behavior

Changing the chat input should not visibly flicker or cause an unnecessary full-window re-render, including on the first change.

Acceptance criteria

• No visible flicker occurs on the first chat input change.
• Subsequent input changes continue to behave normally.

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Requested by Ishaan during a Conclave meeting.