Introduce transcript newlines for function calls/responses

[petersalas]

The TTS buffer only gets flushed when it sees content after a sentence. To ensure that it gets flushed after any pre-function-call filler text, this change:

• Adds the batchFrames render option to ai-jsx to coalesce updates from different parts of the render tree. (This delays surfacing frames until further rendering is blocked on I/O.)
• Adds message-level state tracking ("in-progress" | "done") in fixie-sdk to text messages
• Changes the fixie backend in the voice demo to emit newlines after "done" text messages
• Stops appending text after "in-progress" text messages

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Name	Status	Preview	Comments	Updated (UTC)
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