feat: add keyboard shortcut for enhance prompt functionality

[roomote]

Summary

This PR adds a keyboard shortcut (Ctrl+Shift+E / Cmd+Shift+E on Mac) to trigger the enhance prompt functionality, allowing users to enhance their prompts without manually clicking the button.

Changes

• Added new VS Code command roo-cline.enhancePrompt in package.json
• Configured keyboard shortcut keybinding for the command
• Registered command handler in registerCommands.ts that sends a message to the webview
• Added triggerEnhancePrompt message type to ExtensionMessage interface
• Updated ChatTextArea component to handle the keyboard shortcut trigger message

Testing

1. Open the Roo Code extension
2. Type a prompt in the chat input
3. Press Ctrl+Shift+E (or Cmd+Shift+E on Mac)
4. The enhance prompt functionality should be triggered, same as clicking the wand button

Benefits

• Improves user productivity by providing quick keyboard access to prompt enhancement
• Maintains consistency with VS Code's keyboard-driven workflow
• No breaking changes - the button functionality remains unchanged

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Important

Adds a keyboard shortcut for the enhance prompt functionality, allowing quick access via Ctrl+Shift+E / Cmd+Shift+E on Mac.

• Behavior:
  • Adds roo-cline.enhancePrompt command in package.json with a keyboard shortcut (Ctrl+Shift+E / Cmd+Shift+E on Mac).
  • Registers enhancePrompt command handler in registerCommands.ts to send triggerEnhancePrompt message to webview.
  • Updates ChatTextArea.tsx to handle triggerEnhancePrompt message and execute handleEnhancePrompt().
• Interfaces:
  • Adds triggerEnhancePrompt to ExtensionMessage type in ExtensionMessage.ts.
• Misc:
  • Updates localization strings in package.nls.json for command.enhancePrompt.title.

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