feat: perf: Reduce virtual list rendering overhead in client chat history view (Closes #557)

[Pratikshya32]

Critical Architectural Contribution

This PR resolves the critical requirements of #557.

Changes

• Added solution template for Frontend/src/components/VirtualMessageList.jsx.
• Outlined verification roadmap in docs/improvements/critical_chat_557.md.

Closes #557

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 23b5c39a-1964-4eb2-9288-434a4cc70c13

📥 Commits

Reviewing files that changed from the base of the PR and between 48e8f3e and e395483.

📒 Files selected for processing (1)

• docs/improvements/critical_chat_557.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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