[dashboard-components] refactor: extract view section chrome helper

Summary

Extract renderViewSectionChrome(...) and renderContextChrome(...) into pages/dashboard/src/components/view-chrome.js and reuse them across custom metric, table, and chart renderers.

Duplication evidence

• pages/dashboard/src/presenter.js:565 and pages/dashboard/src/presenter.js:571 previously paired renderViewHeader(sourceName, metadata) with renderContextList(contextDetails) inside renderMetricView(...).
• pages/dashboard/src/presenter.js:594 and pages/dashboard/src/presenter.js:616 previously paired the same header/context construction inside renderTableView(...).
• pages/dashboard/src/presenter.js:643 and pages/dashboard/src/presenter.js:673 previously paired the same header/context construction inside renderChartView(...).

Call sites collapsed

• pages/dashboard/src/presenter.js — renderMetricView(...)
• pages/dashboard/src/presenter.js — renderTableView(...)
• pages/dashboard/src/presenter.js — renderChartView(...)

Tests added

• pages/dashboard/test/unit/view-chrome.test.js
  • DLS-VIEW-013 coverage for populated and empty renderContextChrome(...)
  • DLS-VIEW-013 coverage for composed renderViewSectionChrome(...)

Behavior preservation evidence

• Full dashboard gate stack remains green from pages/dashboard/:
  • npm install ✅
  • npm run typecheck ✅
  • npm run lint ✅
  • npm test ✅
  • npx playwright test --config=playwright.config.mjs ✅
• Rendered behavior was compared structurally via the captured refactor diff at /tmp/gh-aw/agent/view-section-chrome-refactor.diff, confirming the affected presenter changes are limited to replacing repeated custom-view chrome assembly with shared helpers while preserving DOM text, class names, and accessible labels.

Blockers

• None.

Next candidates

• Extract the repeated custom-view state-message plus context composition in src/presenter.js.
• Extract shared pure helpers for metric/chart aggregate value formatting in src/presenter.js.
• Extract shared link-cell composition across custom metric and custom table views.

Generated by ♻️ Daily Dashboard Component Refactorer · pi · gpt54 · 36 AIC · ⌖ 7.2 AIC · ⊞ 5.4K · ◷