* feat(ai): enhance test run functionality with session management
* fix: ensure session ID is returned from test run mutation
* chore: improve success message for test run
* fix(task): handle test run errors and improve user feedback
Added error handling for test run failures, dismissing the loading toast and providing specific error messages. Introduced a delay before switching to chat to ensure backend readiness.
* chore: update test start message for clarity in multiple languages
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