Enhance prompt button for openrouter

[mrubens]

This adds a new "Enhance Prompt" feature when using OpenRouter, providing an intelligent way to improve prompt quality before sending a message. It's currently hardcoded to use OpenAI 4o through OpenRouter for the prompt enhancing since that seems to perform better than the other models. In the future I'd like to make it easier to select different models for the prompt enhancing and for it to work outside of OpenRouter, but configuring multiple models was more complicated than I had time for this week.

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Important

Add "Enhance Prompt" feature using OpenRouter's API with UI integration and tests.

• Feature:
  • Add "Enhance Prompt" feature using OpenRouter with OpenAI 4o.
  • Implement enhancePrompt function in enhance-prompt.ts.
  • Add completePrompt method to OpenRouterHandler in openrouter.ts.
• UI:
  • Add "Enhance Prompt" button in ChatTextArea.tsx.
  • Handle enhanced prompt responses in ChatTextArea.tsx.
• Tests:
  • Add tests for enhancePrompt in enhance-prompt.test.ts.
  • Add tests for "Enhance Prompt" button in ChatTextArea.test.tsx.
• Misc:
  • Update Cline.ts to use enhancePrompt method.
  • Add enhancedPrompt message type to ExtensionMessage.ts and WebviewMessage.ts.

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Latest commit: ab20656

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