#7484 chore(tooling): upgrade Bun to 1.4.1

Summary

• upgrade Bun to 1.4.1 across package metadata, CI, containers, and sandbox configuration
• retain the existing lockfile after a frozen install and verify Bun-sensitive build and YAML paths

Type of Change

• Chore

Testing

• bun install --frozen-lockfile
• bun run lint
• bun run check:audits
• bun run docs-manifest:check
• bun run type-check
• bun run test
• bun run images:check
• production Sim build and CLI bundle builds under Bun 1.4.1

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)