fix: added toast notification for share button

[rupeshca007]

Closes #839

This pull request adds missing visual feedback for the Share button in the sidebar. Previously, generating a share link gave no feedback to the user.

Changes

• Replaced the static message import from antd in PlaygroundSidebar.tsx with the context-aware App.useApp() hook.
• This ensures the message.success toast notification successfully renders within the application's React tree when the user clicks the Share button.

Flags

• None.

Screenshots or Video

N/A

Related Issues

• Issue Bug/UX: Missing visual feedback (toast/notification) when clicking the "Share" button #839

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

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[github-actions]

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