Test chat agentic pause/play

[connor4312]

• anyOS @jrieken
• anyOS @luabud

Complexity: 3

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In this iteration we polished the "play/pause" button available on agent mode chat.

1. In agent mode, make a request that will take some time.
2. Hit the "pause" button near the chat input.
3. Verify that any pending markdown content is written out. Any ongoing file edit should also be paused.
4. You should be able to send a new message when paused. When you do so, the previous request should be cancelled.
5. You should be able to unpause and have the old request resume.
6. Play around and try to get it to misbehave