Unify markdown rendering across message views

[khaliqgant]

Summary\n- extract shared markdown formatter with code blocks, tables, inline code, links, and mention highlights\n- update channel messages to use shared formatter while preserving @-mentions\n- update thread panel and message list to use shared formatter for consistent rendering\n\n## Testing\n- npm test -- MessageList.test.ts ChannelMessageList.test.ts ThreadPanel.test.ts (fails locally: tsc not found; npm install timed out)

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📊 4 files reviewed • 1 high risk • 5 need attention

🚨 High Risk:

• src/dashboard/react-components/MessageList.tsx — Critical modifications may allow XSS vulnerabilities and have removed essential functionality.

⚠️ Needs Attention:

• src/dashboard/react-components/MessageList.tsx — Significant changes to rendering logic require additional scrutiny to ensure functional integrity.

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