fix(frontend): add documented build command

[Vaibhaav-Tiwari]

Summary

• add the documented frontend build command
• delegate to the existing package lifecycle so daemon and runtime preparation remain centralized

Tests

• npm run typecheck
• npm test (313 files passed; 4,573 tests passed; 7 skipped)
• npm run build
• git diff --check

Risk

Low. This adds an alias to the existing package lifecycle without changing packaging behavior.

Closes #2281

[Vaibhaav-Tiwari]

[ronishrohan]

lgtm