[dashboard-components] Extract summary list view chrome helper

Summary

• extract a reusable renderSummaryList(...) helper into pages/dashboard/src/components/view-chrome.js
• replace the presenter-local summary list builder with the shared helper at every identified call site
• update PLAN.md component inventory and run log for the new extraction queue state

Duplication evidence

• pages/dashboard/src/presenter.js:389, 399, 409, 561, 571, 623, 1127, 1137, 1148, 1160, 1171, 1181, and 1191 all built the same count-list <ul> shape through the presenter-local renderSummaryList(...) helper.
• That helper only wrapped shared summary-list DOM generation, making src/components/view-chrome.js the better reusable home for future built-in and custom page sections.

Call sites collapsed

• runs: status, conclusion, and outcome count summaries
• findings: severity and status summaries
• usage: totals summary
• overview: rollout-mode filtering, workflow active-state inventory, run status summary, run conclusion summary, repository rankings, workflow rankings, and largest AIC spenders

Tests added

• expanded pages/dashboard/test/unit/view-chrome.test.js to cover renderSummaryList(...) directly for populated and empty inputs while keeping the existing renderSummaryRegion(...) assertions

Behavior preservation

• renderSummaryRegion(...) now composes renderSummaryList(...), preserving the same DOM text, class names, and empty fallback message
• captured the focused refactor diff at /tmp/gh-aw/agent/summary-list-refactor.diff showing the presenter change is limited to removing the local helper and importing the shared one
• full test and browser suites remained green after the extraction

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 && npx playwright test --config=playwright.config.mjs ✅

Blockers

• none

Next candidates

• extract repeated overview summary-plus-trend region composition in pages/dashboard/src/presenter.js
• extract repeated definitions/observations dual-region composition for graders and evals
• extract shared pure helpers for observation rollups such as subjects, score values, and model summaries

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