fix: OpenAI max_tokens deprecated & support API retry on request failure

[elibolonur]

Changes

• Fixed: OpenAI API deprecation: replaced max_tokens with max_completion_tokens and updated label in the UI
• Added: Retry button for failed API calls, allowing users to quickly re-run translation requests

Technical Details

• Updated OpenAI request builder to use max_completion_tokens
• Improved error handling to surface clear messages and provide retry option

Testing

• Verified translation requests succeed with gpt-5-mini using max_completion_tokens
• Confirmed Retry button replays failed requests successfully
• All existing tests passing

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[Siilwyn]

Thank you for your contribution. I've had to update the branch to run the test workflow, all green!