Add emoji support for user messages

[Copilot]

Plan for Adding Emoji Support

• Add emoji dependency to requirements.txt
• Implement emoji parsing and rendering functions in utils.py
  • Parse :shortcodes: to Unicode emoji
  • Handle Unicode emoji with accessible labels
  • Implement fallback for unsupported emojis
• Add all exports for emoji functions
• Update package exports in init.py
• Create comprehensive tests for emoji functionality
• Test emoji parsing, rendering, and fallback behavior
• Run linting and tests to validate changes
• Request code review

Original prompt

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Summary by cubic

Add emoji support in user messages so people can use :shortcodes: and Unicode emoji in chat. This improves expressiveness and keeps rendering consistent across platforms.

• New Features
  • Parse :shortcodes: and Unicode emojis in message text.
  • Render emojis in the chat UI with accessible labels.
  • Fallback to plain text when an emoji isn’t supported.

^{Written for commit 39e476f. Summary will update on new commits.}

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