Match byteveda.org theme: Midnight palette, IBM Plex, hero glow

[pratyush618]

Brings the docs site in line with the byteveda.org homepage — same "Midnight" palette, IBM Plex type, and hero ambiance.

Changes

• Palette — remapped the design tokens to byteveda.org's Midnight values: near-black + electric green (dark) / warm-paper + green (light). The site is fully token-driven, so this recolors everything with no component edits.
• Type — IBM Plex Sans / Mono (was Geist); added viewport.themeColor. Dropped the now-unused geist dep.
• Hero ambiance — green aurora glow (pure CSS, no extra deps) + blueprint grid + a drifting constellation canvas (HeroNet), matching the marketing hero. All gated on prefers-reduced-motion.
• Tools section — subtle accent glow behind the cards via a reusable glow prop on Section.
• DX — .vscode/settings.json silences the CSS validator's false positives on Tailwind v4 at-rules.

Verification

• pnpm typecheck ✅
• pnpm lint (biome) ✅
• pnpm build ✅ (static export)
• Manual: dark + light themes, hero glow + constellation, tools glow.