feat: add sound and browser notifications for agent state changes

[xingyaoww]

Add notification features to improve user experience when the agent needs attention:

• Sound notifications when agent needs input (with toggle)
• Browser tab title flashing when window is not focused
• Tooltips for all trajectory buttons
• Proper SSR handling and i18n support

Sound button:

Browser tab notification:

The notifications trigger when agent state changes to:

• Awaiting user input
• Awaiting confirmation
• Task finished

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:5b95c3c-nikolaik   --name openhands-app-5b95c3c   docker.all-hands.dev/all-hands-ai/openhands:5b95c3c

[xingyaoww]

[amanape]

Very satisfying, but maybe we don't want to play the audio if the user is already focus on the tab?

[xingyaoww]

maybe we don't want to play the audio if the user is already focus on the tab?

hmm good point, although I think a lot of time, I put openhands in a separate screen with tab open, while working on the other screen. We'd actually want openhands to remind us in this case, right?

[amanape]

I believe that you'd be "focusing" on a screen or tab if you click it. I haven't tried but this should mean that even if you have OpenHands on another screen, the tab will be considered "unfocused" if you're doing stuff on the other screen.

You've provided the option to disable the audio too so IDM the current implementation either way

[xingyaoww]

@amanape Yeah.. I think another potential use case would be, I focus on the tab but I'm away in the kitchen cooking stuff 🤣.. In this usecase (that actually happens a lot to me) sound notification while in-focus could still be useful.

But anyway, since we allow the user to toggle off this notification - it should be fine? if ppl are annoyed, they can simply turn this off.

[amanape]

Then in that case maybe we can default to false

[xingyaoww]

done @amanape