[dashboard-components] Extract renderContextList helper

Summary

• extract reusable renderContextList(details) into pages/dashboard/src/components/view-chrome.js
• replace every repeated custom-view .view-context list assembly in pages/dashboard/src/presenter.js
• add unit coverage for populated and empty context-list rendering and update pages/dashboard/PLAN.md

Duplication evidence

• pages/dashboard/src/presenter.js:1238 repeated .view-context list construction in renderCustomViewState
• pages/dashboard/src/presenter.js:1296 repeated .view-context list construction in renderMetricView
• pages/dashboard/src/presenter.js:1341 repeated .view-context list construction in renderTableView
• pages/dashboard/src/presenter.js:1397 repeated .view-context list construction in renderChartView

Call sites collapsed

• renderCustomViewState(...)
• renderMetricView(...)
• renderTableView(...)
• renderChartView(...)

Tests added

• pages/dashboard/test/unit/view-chrome.test.js
  • DLS-VIEW-013 populated custom-view context list rendering
  • DLS-VIEW-013 empty custom-view context list rendering

Behavior preservation proof

• Full existing test suite remains green unchanged.
• Captured the bounded refactor diff at /tmp/gh-aw/agent/context-list-refactor.diff.
• Rendered the existing custom-views presenter fixture after the refactor to /tmp/gh-aw/agent/custom-page-after.html, confirming the same custom metric, table, chart, empty, and unavailable view text is still emitted.
• No DOM text, class names, accessible labels, or fallback messages were changed; only repeated .view-context assembly moved behind the shared helper.

Quality gates

• 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 && npm run test:e2e ✅

Blockers

• None.

Next candidates

• extract repeated built-in summary-section composition for count lists
• extract the next shared pure helpers around subject/provenance/count formatting in pages/dashboard/src/presenter.js
• extract repeated built-in definitions/observations dual-region composition in pages/dashboard/src/presenter.js

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