feat(#639): enforce JSON mode for transcript refinement API

[Shan7Usmani]

Description

The transcript refinement API call previously had no output format constraint, allowing the LLM to return conversational chatter or explanations instead of clean transcript text. This adds OpenAI JSON mode to guarantee structured output.

Changes

• Added response_format json_object to the refinement API request body
• Updated system prompt to instruct the model to return a JSON object with a text key
• Added JSON parsing with fallback to raw content for backward compatibility

Testing

• TypeScript compiles clean (tsc --noEmit)
• Existing tests pass

Fixes #639

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📥 Commits

Reviewing files that changed from the base of the PR and between d216444 and ff39627.

📒 Files selected for processing (7)

• README.md
• src/background.ts
• src/dashboard.ts
• src/manifest.json
• src/utils/domHelpers.test.ts
• src/utils/sanitize.test.ts
• src/utils/sanitize.ts

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[github-actions]

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[github-actions]

👋 Thank you @Shan7Usmani for your contribution to Late-Meet!

✅ Verified: You are assigned to the linked issue #639.

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud