[FEATURE]: Invert animations

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

User story:

As a user, I want opencode to pull my attention to the chat that needs my attention.

Currently, one can either enable or disable the animation in the bottom left that indicates that OpenCode is making progress.

This is arguably the wrong way around, as it pulls attention to the window that does not need user input.

Instead, change the animation to a breathing/sleeping pattern and have it appear at chats that have received a STOP token and hence need user input to be "woken up" again.

That way, the user's attention would focus on the chat window that needs their attention, input, or further instructions.

This can be hidden behind a flag that toggles between this behavior or the current behavior.

Try identifying the terminals needing human attention in this screen recording for an instance of this problem:

https://github.com/user-attachments/assets/d5c748d6-ebfd-42f6-ba5c-a204b9b45797