feat: enhance token usage tracking and history management
- Updated HTML assets for improved loading. - Integrated token usage tracking in chat processing, appending usage details to transcripts. - Enhanced OpenAIProvider to include usage data in chat completion responses. - Implemented asynchronous retrieval of recent token usage history. - Added utility functions for managing transcript files and parsing usage data. - Updated UI components to reflect changes in usage status handling. - Ensured consistent usage status definitions across the application.
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