Chore/migrate eslint 9

[navin-oss]

Migrated the project to ESLint 9 using Flat Config (eslint.config.mjs).

• Removed legacy .eslintrc.json.
• Created eslint.config.mjs importing directly from eslint-config-next (v16).
• Updated package.json dependencies:
  • eslint to ^9.0.0
  • eslint-config-next to latest (v16)
  • Added @typescript-eslint/eslint-plugin, @typescript-eslint/parser (v8)
  • Upgraded next, react, react-dom to latest (Next 16, React 19) to ensure compatibility with eslint-config-next v16 and ESLint 9.
• Updated lint script to eslint . as next lint is deprecated/unavailable in Next.js 16.
• Fixed next.config.js by removing deprecated eslint options.
• Fixed app/globals.css import ordering.
• Fixed hydration mismatch issues in app/page.tsx, components/FloatingBackground.tsx, MoodCard.tsx, OrbVisualizer.tsx by moving random generation to useEffect.
• Verified npm run lint passes and next build succeeds.

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