Polish keyword emphasis styling

[suguanYang]

Summary

• Give parsed chunk keyword sections a light emerald panel treatment
• Use more vivid emerald keyword chips with stronger text weight while preserving the existing quiet source/summary/content surfaces
• Add a focused regression assertion for the keyword emphasis classes

Verification

• pnpm test src/components/chunks-panel.test.ts -- --runInBand
• pnpm test
• pnpm exec tsc --noEmit
• pnpm lint
• pnpm build
• git diff --check
• Browser check on http://localhost:3040 confirmed demo keyword panels/chips use the emerald styling and chips wrap without horizontal overflow

[vercel]

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Project	Deployment	Actions	Updated (UTC)
knowhere-notebook	Error		May 10, 2026 6:12pm
knowhere-notebook-staging	Ready	Preview, Comment	May 10, 2026 6:12pm