Add Arcade FAQ chatbot popup

[hoangsvit]

Summary

• Adds a lightweight global Arcade Guide popup on top of PR Redesign monthly labs archive and detail UI #89.
• Answers simple Google Skills Arcade questions without an external AI API/key.
• Covers 2026 point calculation guidance, prize tiers, Waterfall/slot behavior, lab/game timing, Prize Counter timing, shipping, subscription basics and missing-point guidance.
• Includes English UI plus Vietnamese question/answer support.
• Adds quick prompts, official source links and a shortcut to /monthly-labs/.
• Hides the chatbot on /widget embeds and positions it above the mobile bottom navigation.

2026 sources reviewed

• Google Developer Forums: official 2026 tier announcement (Trooper 50–74, Ranger 75–94, Champion 95–119, Legend 120+; limited slots + waterfall).
• Google Developer Forums: 2026 Prize Counter clarification (single unified window after season end; points remain protected).
• Google Cloud Blog: Arcade game/lab and badge overview.
• Google Developer Forums: 2026 special-game example showing that special-game point values can differ.

Implementation

• components/arcade/arcade-faq-chatbot.tsx
• app/styles/arcade-chatbot.css
• app/layout.tsx
• tests/arcade-chatbot.test.mjs

Notes

• This is a stacked PR on Redesign monthly labs archive and detail UI #89 (refactor/monthly-labs-ui) so it does not mix unrelated base changes.
• Google remains the final authority for official point totals, dates and reward eligibility; the chatbot explicitly says so for time-sensitive answers.

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