feat: add Linear-style collection views

[karngyan]

Summary

• add Linear-inspired DataTable grouping, sorting, selection, pinning, density, filters, view options, hover actions, and bulk actions
• add TanStack Form integration plus component documentation
• improve dark-mode badges, compact row styling, popover surfaces, loading and empty states
• publish llms.txt, Markdown component docs, and Accept: text/markdown responses

Verification

• 257 component tests pass
• 8 accessibility checks pass in light and dark modes
• package and docs typechecks pass
• production build passes
• Prettier formatting check passes