Implement Table pattern surfaces

[Copilot]

Baseline documentation change

Scope

This adds the missing repository-owned Table surfaces so the pattern exists end-to-end in Runtime: token export, CSS pattern, progressive enhancement, macros, docs, playground wiring, and Code Connect stub. The only unresolved part remains the external Figma publication dependency, so the schema keeps TABLE-NODE-ID as a placeholder.

• Pattern + behavior

  • Adds src/ui/patterns/table.css for sticky headers, sortable states, row selection, loading/empty states, density variants, and resizable-column affordances.
  • Adds src/ui/components/table.js with enhanceTable() / observeTable() for sort toggling, single/multi row selection, checkbox sync, keyboard activation, and column resizing.

• Design-token integration

  • Adds 16 --uif-table-* component tokens to figma/exports/Patterns (UI).tokens.json.
  • Keeps runtime-only resize width state out of the token namespace via an allowlisted custom property.

• Authoring surfaces

  • Adds table macros to site/_includes/macros/ui.njk (table, tableHead, tableBody, tableFoot, th, tr, td).
  • Wires table into src/ui/index.css, playground renderers/code generators, and the patterns index.

• Docs + schema

  • Adds site/patterns/table.md and site/patterns/table-playground.md.
  • Adds schemas/web-table.figma.ts with the expected mapping shape; Figma node ID stays unresolved until the component is published.

{% call uif.table(caption="Destinations", selection="single", sortable=true) %}
  {% call uif.tableHead() %}
    <tr>
      {{ uif.th("Destination", sort=true) }}
      {{ uif.th("Departure", sort=true) }}
      {{ uif.th("Duration") }}
      {{ uif.th("Price") }}
    </tr>
  {% endcall %}
  {% call uif.tableBody() %}
    {{ uif.tr(["Mallorca", "15 Aug 2025", "7 nights", "£499"]) }}
  {% endcall %}
{% endcall %}

Review checklist

• Terminology is consistent with docs/terminology.md.
• docs/canonical-reference-matrix.md is updated when new terms, rules, or canonical sources are introduced.
• @ui-foundations-maintainers has been notified for review.
• Ownership remains team-based; no person-specific or parallel ownership rule is introduced.
• Changes preserve the Runtime/Vault authority boundary.
• Relevant documentation and CI checks pass.

• Fixes Component: Table #52