Reported by @distant apex
Bug Report: Read Aloud does not play audio in Temporary Chats
`Steps to Reproduce`
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Start a Temporary Chat.
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Send a prompt and wait for the assistant’s reply.
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Click the Read Aloud (speaker) icon on that reply.
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(Optional) Switch voices and try again.
`Expected Result`
Audio playback starts for the selected message with normal play/pause/progress controls.
`Actual Result`
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No audio plays.
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A red toast appears: “Failed to play message.”
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No detailed error is shown to the user.
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Read Aloud works in regular (non-temporary) chats.
`Environment`
Browsers: Chromium “stable”, Firefox “latest”; also reproduced on mobile browsers (Android & iOS)