fix(build): correct docs workspace filter and add offline emoji-data …

[shaayar]

Summary

• fix root monorepo build filter to target the actual docs workspace package
• make emoji data generation resilient in offline/restricted network environments
• keep existing emoji-data.json as fallback when remote fetch is unavailable

Changes

• updated core/package.json
  • build script changed from:
    • turbo build --filter=docs...
  • to:
    • turbo build --filter=@once-ui-system/docs...
• updated core/packages/core/scripts/generate-emoji-data.js
  • validate HTTP status code when fetching remote emoji data
  • fallback to local src/data/emoji-data.json if fetch fails
  • only fail hard when remote fetch fails and no local fallback exists

Why

• pnpm build in core/ failed because docs is not a workspace package name
• build also failed in offline/restricted environments due to remote fetch dependency on raw.githubusercontent.com

Validation

• ran pnpm --dir core build
• confirmed @once-ui-system/core now proceeds past emoji fetch failures using local fallback
• confirmed docs build now reaches Next.js build phase (remaining external network dependency is Google Fonts)

Notes

• engine warning persists (node: 20.x expected, local is v24.13.0)
• docs app still requires network access for next/font/google unless moved to local fonts

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