[dashboard-language] Built-in pages: validate canonical explicit titles

Milestone

Built-in pages

Specification coverage

• Section 10.2
• DLS-PAGE-001

This increment tightens built-in page validation so explicit title values must match the specification's canonical capitalized page-name default. Existing omitted-title handling remains in place.

What changed

• Added canonical explicit built-in title validation in pages/dashboard/src/validator.js.
• Added unit tests for accepted canonical explicit titles and rejected non-canonical explicit titles in pages/dashboard/test/unit/validator.test.js.
• Updated pages/dashboard/PLAN.md with the completed slice and run log.

Quality gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ⚠️ blocked by infrastructure: Playwright Chromium executable is not provisioned in this environment (browserType.launch: Executable doesn't exist)

Blockers

• Browser end-to-end tests cannot launch because the required Playwright Chromium executable is missing from the workflow environment.

Next milestone

• Built-in pages: next slice for declarative built-in page definitions.

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