Fix(sistent): Added Table component documentation

[kanishksingh23]

Description
Adds Table component documentation to the Sistent component library, including:

• Basic Table demo
• Sortable Table demo
• Selectable Rows Table demo (with working checkbox selection)
• Paginated Table demo

All demos use ResponsiveDataTable from @sistent/sistent.

This PR fixes #7607

Notes for Reviewers

• Used useMemo for stable column/data references
• Selectable rows wired up with rowsSelected and onRowSelectionChange
• Added mounted state guard to fix SSR build failures
• Generic names used in all demo data (Alice, Bob, Charlie)

This is a re-submission of PR #7692 which was closed due to git history issues
during conflict resolution. All reviewer feedback from the previous PR has been addressed.

Signed commits

• Yes, I signed my commits.

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