Refine light-theme cards and mobile presentation

[Fremen1990]

The light theme now pairs a light TheEventa card with a dark Car Brain card. Existing dark-mode surfaces and the Terminal skin are preserved. Shorter EN/PL Car Brain copy removes repeated platform explanations while retaining product features, cloud functions and development status.

Supporting role labels, timeline dates and screenshot captions are larger. The mobile architecture panel uses tighter spacing without hiding nodes or explanations. E2E titles and descriptions consistently say “about an hour” in both languages.

Validation:

• ESLint, TypeScript, Prettier and production static export passed.
• 112 unit tests and all 285 Playwright tests passed, including accessibility checks.
• Chromium visual review: desktop light/dark and Terminal light; Polish mobile at 390px and 320px. No observed horizontal page overflow.
• In-app browser unavailable; repository Chromium used. No physical-device, Safari or Firefox acceptance claimed.

No CV, Car Brain application, store-availability gate or unrelated repository changes. Merge and resulting deployment are explicitly authorized by Tomasz.