[JS] Fix is_generating check fails

[Retribution98]

Description

Reset is_generating flag before calling report_error() in the error path of generatePerformInferenceThread to prevent a race condition where the JS event loop could schedule the next generate() call before the native thread clears the flag.

CVS-182798

Checklist:

• This PR follows GenAI Contributing guidelines.
• Tests have been updated or added to cover the new code.
• This PR fully addresses the ticket.
• I have made corresponding changes to the documentation.

[Copilot]

Pull request overview

Fixes a JS bindings race where the next generate() call can be scheduled before the native inference thread clears the is_generating flag in error paths, causing erroneous “already in progress” failures.

Changes:

• Reorders error handling in Whisper/VLM native inference threads to clear is_generating before calling report_error().
• Updates LLM native inference thread error handling to clear is_generating, report the error, then finalize() and return (preventing fall-through into the success path).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
src/js/src/whisper_pipeline/pipeline_wrapper.cpp	Clears is_generating before invoking report_error() on inference exceptions.
src/js/src/vlm_pipeline/vlm_pipeline_wrapper.cpp	Clears is_generating before invoking report_error() on inference exceptions.
src/js/src/llm_pipeline/llm_pipeline_wrapper.cpp	Clears is_generating and properly finalizes/returns on inference exceptions.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

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[kkm121]

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