[dashboard-components] Refactor view chrome paragraphs

Summary

• extract reusable custom-view paragraph chrome into renderViewChrome(lines) in pages/dashboard/src/components/view-chrome.js
• rewire renderViewHeader(...) to compose the new helper without changing rendered text or class names
• add unit coverage and update pages/dashboard/PLAN.md with the bounded refactor and remaining queue

Duplication evidence

• pages/dashboard/src/components/view-chrome.js:76 previously assembled the same paragraph DOM shape inline for the source line and metadata line, differing only by class selection and text content
• the repeated shape was the best remaining bounded extraction that fit in one run without changing page semantics or broadening component APIs

Call sites collapsed

• pages/dashboard/src/components/view-chrome.js:76 source paragraph in renderViewHeader(...)
• pages/dashboard/src/components/view-chrome.js:77 metadata paragraph in renderViewHeader(...)

Tests added

• pages/dashboard/test/unit/view-chrome.test.js adds coverage for populated and empty renderViewChrome(...) inputs while preserving existing renderViewHeader(...) assertions

Behavior preservation evidence

• renderViewHeader(...) now composes renderViewChrome(...), preserving the same .view-source first paragraph and .view-metadata subsequent paragraphs with identical text
• captured the bounded refactor diff at /tmp/gh-aw/agent/view-chrome-refactor.diff

Gates run

• cd pages/dashboard && npm install ✅
• cd pages/dashboard && npm run typecheck ✅
• cd pages/dashboard && npm run lint ✅
• cd pages/dashboard && npm test ✅
• cd pages/dashboard && npx playwright test --config=playwright.config.mjs ✅

Blockers

• none

Next candidates

• extract the repeated custom-view section composition shared by metric, table, and chart renderers in src/presenter.js
• extract shared pure helpers for chart/table row text formatting and link-column composition
• extract the repeated state-message plus context composition in unavailable and empty custom views

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