Multi FileFeed builder UX improvements

We’ve rolled out a series of enhancements to the Multi FileFeed builder to make workflows easier to build, navigate, and understand:

• Clearer workflow visuals: Edges now use structured right-angle routing for improved readability.
• Faster node editing: Add steps anywhere in your flow with a new inline insert option, while keeping existing connections intact.
• Keyboard shortcuts: Quickly access common actions like test runs, auto-layout, and zoom controls via a new shortcuts panel.
• Smoother interactions: Improved drag indicators, hover states, and stable viewport behavior create a more predictable editing experience.
• Enhanced file previews: Preview images and Office files directly in the builder with zoom and navigation controls.
  Together, these updates make it easier to build, debug, and iterate on complex workflows.