Make the Car Brain introduction easier to scan

[Fremen1990]

Summary

• Split each gain, cost and revisit line into its own paragraph in English and Polish.
• Lead the article with the Car Brain home screen, and keep refuels and service history in the row below. The home-screen caption notes that the last-service time is clipped and that the figures are sample data.
• Give the Expo box a paper fill and a stronger edge so it stays visible on the light diagram. Dark mode keeps the same structure. No animation.

Test plan

• Blog unit tests, typecheck and lint
• e2e/blog.spec.ts (28 tests) on the static export
• Light and dark Standard diagrams checked in the browser; the opening phone is 220px and centered
• CI green, then merge and confirm both live article URLs

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