Dependency maintenance batch: update outdated packages safely #14

Problem

npm outdated shows multiple dependencies behind wanted/latest versions (framework, tooling, and runtime libraries).

Required Work

1. Group upgrades into safe batches:
   • Tooling batch (eslint, types, dotenv)
   • Styling batch (tailwindcss ecosystem)
   • Runtime/UI batch (framer-motion, icons, three/fiber)
2. For each batch:
   • Upgrade
   • Run lint/build/audit
   • Note changelog breaking changes
3. Open follow-up PR(s) with rollback notes.

Acceptance Criteria

• Outdated count reduced significantly without build regressions.
• Each upgrade batch is validated and documented.
• No new vulnerabilities introduced.