[dashboard-language] Built-in pages: definition interpreter slice

Summary

• Milestone: Built-in pages
• Covered requirement identifiers: DLS-PAGE-001 through DLS-PAGE-014 for the existing built-in presenter slice, with this increment specifically continuing the declarative migration by routing built-in page body rendering through ordered dashboard.json definition.views
• Refactored pages/dashboard/src/presenter.js so built-in pages render through renderBuiltInPageFromDefinition(...) plus reusable section renderers, removing the remaining top-level per-page wrapper dispatch functions
• Kept the implementation conservative and specification-aligned by reusing the existing implementation-local definition.views contract already tracked in PLAN.md, without inventing new YAML semantics
• Updated pages/dashboard/PLAN.md to record the shipped increment and mark the built-in page body refactor subtask complete

Gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npx playwright test --config=playwright.config.mjs ✅

Blockers

• None in this increment

Next milestone

• Built-in pages: narrow the remaining gap between the current ordered definition.views assumption and a fully generic declarative built-in composition model if the specification defines one

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