fix(llc): Fix TranscriptionSettingsResponse.fromJson null handling

[Brazol]

Summary by CodeRabbit

• Bug Fixes
  • Fixed a crash that occurred when transcription settings received an empty or null language value from the backend. The app now gracefully handles this scenario with a sensible default.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 76b046de-9022-4261-ac59-e26b13b8c61e

📥 Commits

Reviewing files that changed from the base of the PR and between 4a2e21a and e71a36f.

📒 Files selected for processing (2)

• packages/stream_video/CHANGELOG.md
• packages/stream_video/lib/open_api/video/coordinator/model/transcription_settings_response.dart

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📝 Walkthrough

Walkthrough

This pull request fixes a null-check error in TranscriptionSettingsResponse.fromJson that occurred when the backend provides an empty string for the language field. The fix applies a null-coalescing operator to default to the auto enum value, with a corresponding CHANGELOG entry documenting the fix.

Changes

Cohort / File(s)	Summary
Documentation packages/stream_video/CHANGELOG.md	Added entry documenting the bug fix for TranscriptionSettingsResponse.fromJson null-check error handling.
Bug Fix packages/stream_video/lib/open_api/video/coordinator/model/transcription_settings_response.dart	Updated fromJson to handle null language values using null-coalescing operator, defaulting to auto enum value instead of forced non-null assertion.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A null came hopping through the code,
Making transcriptions fall and load!
With a gentle coalesce and auto's grace,
We caught that null and set its place.
Language flows like carrots now,
From empty strings—we've fixed it, wow! 🥕

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided by the author; the required template sections are entirely missing.	Add a comprehensive description following the template, including Goal, Implementation details, Testing explanation, and required Contributor Checklist items.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main fix: addressing null handling in TranscriptionSettingsResponse.fromJson method.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/fix-translation-null-language

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 5.77%. Comparing base (4a2e21a) to head (e71a36f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...dinator/model/transcription_settings_response.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1224   +/-   ##
=====================================
  Coverage   5.77%   5.77%           
=====================================
  Files        676     676           
  Lines      49335   49325   -10     
=====================================
  Hits        2848    2848           
+ Misses     46487   46477   -10     

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