refactor(session): simplify LLM stream by replacing queue with fromAsyncIterable

[thdxr]

Summary

Simplifies the LLM streaming implementation by removing the manual queue-based approach and using Stream.fromAsyncIterable directly.

Changes

• Removes the Queue.unbounded and manual queue management
• Replaces async queue filling with direct Stream.fromAsyncIterable usage
• Simplifies error handling by passing error mapper directly to fromAsyncIterable
• Reduces code complexity (15 deletions, 5 insertions)

This change makes the stream handling more idiomatic and reduces potential race conditions with the queue-based approach.

[greptile-apps]

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