feat(cli): Improve new file diff rendering with syntax highlighting

- Enhance the  component to provide better readability for newly created files.
- Instead of displaying a standard line-by-line diff for new files, extract the added content and render it with syntax highlighting based on the file extension.
- Refactor the existing diff rendering logic into a separate  function.
- Add a helper function  to map common file extensions to language names for syntax highlighting.

Fixes: https://b.corp.google.com/issues/414279447
Signed-off-by: Gemini, your friendly neighborhood code agent.

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