fix(renderer): improve inline code detection logic

[Galfurian]

This PR improves the inline code detection logic in the EnhancedMessageRenderer component to handle cases where the inline prop from react-markdown is undefined.

Changes Made

• Create an isInlineCode condition in EnhancedMessageRenderer.jsx to include a fallback detection method:
  inline !== false && (!className && !String(children).includes('\n'))

Rationale

The added fallback ensures inline code is correctly identified when:

• No language class is present (indicating it's not a fenced code block)
• The content contains no newlines (as inline code should be single-line)

This maintains proper rendering of inline code with appropriate styling while preserving code block functionality. The fix is minimal and backward-compatible.