Refactor Guest discovery and Halloween UI with Node.js checks

[hoangsvit]

Guest previously looked like an empty Profile dashboard: a large score hero, repeated profile prompts, full-width tier rows before the labs, and a saved profile URL still visible in the form. Halloween overrides also covered content and painted dark surfaces in light mode; the preview mode switch lost its styling in Profile mode.

This PR makes Guest a public Arcade discovery page and fixes the seasonal/preview presentation:

• Use a compact localized discovery hero, followed by monthly games and a public tier/reward sidebar on desktop. On mobile, games come before tiers; compact cards prioritize title, code, points, deadline and the enrollment link. Move the extension strip below discovery, remove the large guest banner and obsolete styles, and point guest navigation at Labs instead of an absent personal badge section.
• Start new visitors in Guest and restore saved profiles into Profile. Keep a separate empty Guest input, hide Reset in Guest, and preserve stored profile data when toggling preview modes.
• Show one profile-tracking hint instead of repeating it on every public game card. Add a localized retry panel when the game feed fails instead of leaving an empty column. New copy is complete in all 13 catalogs; localized Guest headings are prerendered and checked for SEO.
• Consolidate Halloween colors, move decoration behind the scrolling hero, simplify mobile artwork, retain the dark-only moon and support reduced motion/forced colors. Refresh activation on navigation, preferences and date rollover, excluding widgets.
• Style preview mode controls in both Guest/Profile with theme fallbacks and icon spacing.
• Use Node.js for managed static serving and GA HTML validation in CI/deployment; remove the Python validator.

Validation: 151 unit tests passed; i18n generation, TypeScript and lint passed (existing warnings remain). Production and PR static builds passed; GA and SEO export checks passed for the homepage and all 12 localized routes. Browser verification passed 36 Guest combinations (English/Vietnamese/German × light/dark × 320/390/1440px on production and PR builds), including code copying, successful analysis, stored-profile restoration, Guest privacy and failed-feed retry. Existing seasonal/preview checks passed 48 combinations. Desktop/mobile screenshots inspected. Browser tests use deterministic game/profile fixtures and isolate external feeds.

Based on main; unrelated open UI PRs are not included.

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[github-actions]

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