agent_ui: Clear model selector query on dismiss (#37569)

Closes #36756

| Before | After |
|--------|--------|
| <video src
="https://github.com/user-attachments/assets/1d022ac6-0aea-4e98-a717-9988420c9683"/>
| <video
src="https://github.com/user-attachments/assets/78d19012-1224-4c92-a6c8-47ae4c13ca31"/>
|

Release Notes:

- agent: Clear model selector query on dismiss in agent panel

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Signed-off-by: Umesh Yadav <git@umesh.dev>
36364b16a0Umesh Yadav committed on 9/8/2025, 4:52:57 AM· committed by GitHubparentb35959f
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