[dashboard-language] Built-in pages: graders render slice

Milestone

Built-in pages

Specification coverage

• Section 10 Built-in Pages
• DLS-PAGE-008
• DLS-PAGE-014

What shipped

• Added presenter support for the graders built-in page.
• Rendered separate grader definition and grader observation tables from declarative built-in page definitions.
• Exposed observed subject, result, score when present, time, provenance, and independent availability/completeness/freshness summaries.
• Added unit and Playwright browser coverage for the same supported slice.

Gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ✅

Blockers

• None.

Next milestone

Built-in pages: render the evals built-in page from declarative definitions.

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