v1.4.537

## Changes

### PR [#2291](https://github.com/danielmiessler/Fabric/pull/2291) by [pcbeingused333](https://github.com/pcbeingused333) and [ksylvan](https://github.com/ksylvan): fix(lmstudio): close the stream channel on every error path

- Fixed LM Studio streaming so the stream channel is closed on every error path, preventing hangs and leaked goroutines.
- Consolidated the LM Studio stream error channel closure tests, combining HTTP failure and unavailable server scenarios into subtests.
- Updated tests to call `SendStream` directly and verify immediate channel closure, removing redundant goroutines, error channels, and timeout dependencies.