feat: Retro CRT arcade theme for Wordle

[devin-ai-integration]

Summary

Complete visual overhaul replacing the modern Wordle design with a retro CRT arcade aesthetic. Changes are purely CSS/SCSS with one minor JSX tweak (adding a ▶ character to the header title).

Key visual changes:

• Font: Swapped Baloo 2 / Poppins for Press Start 2P (Google Fonts pixel font)
• Color palette: Neon green (#00ff41) on near-black (#0a0a0a) CRT-monitor style
• CRT effects: Scanline overlay (body::before, z-index 9999) and edge vignette (body::after, z-index 9998) via pseudo-elements with pointer-events: none
• Geometry: All border-radius values set to 0 for a pixelated/blocky feel; cells and keys use solid 2px green borders
• Glow effects: text-shadow and box-shadow neon glow on title, cells, keys, and buttons
• Header: Flickering title animation (titleFlicker keyframe)
• Accent colors: Magenta (#ff00ff) share button, cyan (#00ffff) stat bars, amber (#d4a017) for "present" status
• High contrast mode: Changed from cyan/orange to pink/cyan

Review & Testing Checklist for Human

• Run locally and visually verify the retro theme — no screenshots are included in this PR. Start the dev server (npm start) and check the grid, keyboard, all three modals (info, stats, settings), and alert toasts
• Light/dark mode toggle is now a no-op — the default root CSS variables and the [data-theme='dark'] block are identical. Verify this is acceptable or if the light theme should offer a different retro palette
• Readability of pixel font at small sizes — font sizes were reduced significantly (e.g., 0.45rem for labels, 0.5rem for descriptions). Check on mobile viewports (≤480px) that text is still legible
• High contrast mode accessibility — colors changed from #06b6d4/#f97316 (cyan/orange) to #ff6ec7/#00ffff (pink/cyan). Confirm these still provide sufficient contrast for users with color vision deficiencies
• CRT scanline z-index (9999) layering — the scanline overlay renders above modals (z-index 500) and alerts (z-index 1000). Verify modals are still visually clear through the scanline effect

Notes

• Many new colors are hardcoded rather than using CSS variables (e.g., hover states, glow values). Future theme work may want to extract these.
• The old fonts (Baloo 2, Poppins) are fully removed from index.html. If Press Start 2P fails to load from Google Fonts, the fallback is generic monospace.
• Cell reveal animations now also transition border-color alongside background-color, and correct cells get an additional box-shadow glow at the end of the animation.

Link to Devin session: https://app.devin.ai/sessions/c25ae88fdd7840aab7de963ba5b75242
Requested by: @matthewguerra-cog

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.