Refactored the `useStore` hook to be imported from a dedicated `StoreContext` to improve code organization and maintainability. Also, enhanced responsive design for better usability on various screen sizes, including tablet-specific adjustments for the sidebar and header.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 95e8aab4-f39f-4b48-aa57-a759ec15ba3d
Replit-Commit-Checkpoint-Type: full_checkpoint
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