Closes #53266

When a tool call awaiting permission is below the viewport, it’s easy to
miss why the agent has stopped working. This PR adds a floating row at
the bottom of the panel that mirrors the pending permission request.

It reuses the same permission prompt, so you can allow or deny it and
see the raw input without scrolling to the end of the thread. It offers
a "Scroll to" button to jump back to the inline prompt in the thread.
Once the inline prompt is in view, the floating row disappears. If
multiple tool calls need permission, including a subagent’s, they’re
shown one at a time so rows don’t stack on top of each other.

<img width="508" height="181" alt="image"
src="https://github.com/user-attachments/assets/7d5fedd6-bc4d-4674-8ea2-5c8f2ed3aff6"
/>

Release Notes:

- Improved visibility of pending tool call confirmations in the Agent
Panel when its scrolled out of view.

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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>