fix(frontend): robust WebSocket reconnection for terminal reliability (by vbs_0)

[vbs-0]

What

• Implements robust WebSocket reconnection logic in the frontend terminal context.
• Fixes issue where the terminal would stop updating after a disconnect, requiring a page refresh.

Why

• Ensures the terminal automatically recovers from WebSocket disconnects.
• Improves user experience and reliability for long-running terminal sessions.

How

• Adds exponential backoff with jitter for reconnection attempts.
• Limits reconnection attempts to prevent infinite loops.
• Ensures only one socket is created and managed at a time.
• Cleans up all timeouts and sockets on unmount or reconnection.
• Uses consistent backend URL logic.
• Removes duplicate/legacy connection logic and event handler registration.
• All new logic is properly attributed to vbs_0.

Changelog

• Terminal now automatically recovers from WebSocket disconnects.
• No more manual page refresh required after network interruptions.

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Checklist:

• Follows OpenHands contributing guidelines
• PR title uses the correct prefix and scope
• User-facing bugfix, changelog entry included

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Closes #8447 (#8447)

[amanape]

I'll try to test this soon, but I don't think this is the best solution to fix terminal issues

[amanape]

Please limit comments to information that helps with code clarity and/or functionality, authorship is already tracked via version control.

[vbs-0]

ok sir as it was my first pull request i got little excited

[tofarr]

Interesting approach - I was under the impression that the socketio library handled reconnection automatically? The disconnect event is often explicit - like when a user has too many conversations open, and reconnection would not be desirable.

[github-actions]

This PR is stale because it has been open for 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions]

This PR was closed because it has been stalled for over 30 days with no activity.