Interface implementation navigation / linking (like GoLand)

[MsN-12]

Body

Problem

When working with languages that rely heavily on interfaces (e.g. Go), Zed currently has no way to link an interface to its implementations, or an implementation method back to the interface definition.

As a result, developers are forced to manually verify function signatures by eye, which is:

• error-prone
• slow
• frustrating in large codebases

This is especially painful when refactoring or reviewing code that implements multiple interfaces.

Expected behavior

Zed should provide interface-aware navigation, similar to GoLand and other full IDEs:

• Jump from an interface method to its implementations
• Jump from an implementation method back to the interface definition
• Visual indication (or quick action) that a type fully or partially implements an interface
• Signature mismatch detection where applicable

Why this matters

Interface-based design is core to many languages (Go, Rust traits, TypeScript interfaces, Java, etc.).
Without proper interface linking, Zed feels closer to a text editor than a modern IDE for these workflows.

This feature would:

• Improve developer confidence during refactors
• Reduce bugs caused by subtle signature mismatches
• Significantly improve DX for interface-heavy projects

Reference

GoLand provides this via:

• Navigate → Implementation
• Navigate → Super Method / Interface
• Inline indicators for interface implementations

Bringing similar functionality to Zed would be a huge productivity win.

Thanks for the great work on Zed — this feature would make it even more compelling for backend and systems developers.