v0.15.4

pathsim is no longer pinned at build time — the runtime resolves the latest version from PyPI, so toolbox requirements (e.g. pathsim-chem's BVP1D) install correctly. Fixes #318.

What's Changed

• Editor: fixed top nav bar (fork layout), remove codegen export by @milanofthe in #317
• Unpin pathsim: resolve latest at runtime by @milanofthe in #319

Full Changelog: v0.15.3...v0.15.4