feat: add chat panel and enhance browse functionality

[prateek041]

fixes: #476

• Introduced a new ChatPanel component with collapsible functionality.
• Updated BrowsePage to include chat panel alongside existing components.
• Enhanced BrowseState to manage chat panel state and size.
• Added keyboard shortcuts for toggling chat panel.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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