[dashboard-language] Built-in pages: source-ordered definition interpreter

Milestone

Built-in pages

What shipped

• Updated the built-in definition interpreter in pages/dashboard/src/presenter.js so rendered built-in sections are matched by declarative definition.views[*].data.source order instead of relying on hard-coded section index positions.
• Repeated sections for the same source are now consumed in declared view order, which keeps built-in page composition more data-driven while preserving the existing conservative implementation-local definition.views contract.
• Added unit coverage in pages/dashboard/test/unit/presenter.test.js for reordered built-in runs page views, proving section title and body rendering follow the declared source-backed view sequence.
• Updated pages/dashboard/PLAN.md with the shipped slice, verification results, and next milestone note.

Specification coverage

• Section 10 Built-in Pages
• Requirement IDs: DLS-PAGE-002, DLS-PAGE-006, DLS-PAGE-008, DLS-PAGE-009, DLS-PAGE-010, DLS-PAGE-011, DLS-PAGE-012, DLS-PAGE-013, DLS-PAGE-014

Quality 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: continue reducing implementation-local assumptions in built-in composition until the remaining gaps are limited to vocabulary the specification does not yet define.

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