fix(sentiment): preserve commentful source rows

[rebelchris]

Summary

• resolve source rows against all matching discussions instead of a single provider map entry
• prefer exact source URLs and keep rows when any matching discussion has comments
• add regression coverage for HN with no comments plus Lobsters with comments

Tests

• NODE_ENV=test node_modules/.bin/jest src/components/post/focus/CommunitySentimentBreakdown.spec.tsx --runInBand (packages/shared)
• node_modules/.bin/prettier --check src/components/post/focus/CommunitySentimentBreakdown.tsx src/components/post/focus/CommunitySentimentBreakdown.spec.tsx (packages/shared)
• node ./scripts/typecheck-strict-changed.js
• NODE_ENV=test node_modules/.bin/jest --runInBand (packages/webapp)

Preview domain

https://codex-fix-sentiment-source-threa.preview.app.daily.dev

[vercel]

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Project	Deployment	Actions	Updated (UTC)
daily-webapp	Ready	Preview	Jul 23, 2026 5:43pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
storybook	Ignored		Jul 23, 2026 5:43pm