[ui] Add semantic primitive ownership Build a layered Zenbu token and sizing system, make authored controls use native-underneath primitives, migrate mrjunejune without imposing visual surfaces, and document/enforce HTML ownership in the catalog and wiki. Co-authored-by: Copilot <[email protected]>

# MrJuneJune Server Configuration

# Auth token for S3 upload API
# Client must send this in Authorization header: Bearer <token>
UPLOAD_AUTH_TOKEN=THIS

# S3 Configuration
S3_REGION=THIS
S3_BUCKET=THIS

# Presigned URL expiration (seconds)
S3_URL_EXPIRES=SECONDS