Modernize Sandbox Manager UI and fix creation workflow#3

Draft

Copilot wants to merge 7 commits intomainfrom

copilot/improve-ui-elements

Commits on Dec 9, 2025

Initial plan
Copilot
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Enhanced sandbox dashboard UI with modern design

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codingwithnsh
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Add quick start guide, better error handling, and improved logging

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codingwithnsh
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Add comprehensive UI documentation and mockups

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codingwithnsh
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Address code review feedback - move imports and clarify lambda closures

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codingwithnsh
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Add final project summary and completion documentation

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codingwithnsh
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Add user-friendly CHANGES.md documentation

Copilot
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codingwithnsh
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