Developed a Diagnostic Navigation Enhancement for the zed-industries/zed repository, focusing on improving how diagnostics are activated and navigated within the editor. The work ensured that the diagnostic under the cursor is always activated before moving to the next or previous diagnostic, addressing edge cases where the global diagnostic renderer might not be registered. This feature was implemented in Rust, leveraging skills in diagnostic handling, editor development, and test automation. Comprehensive tests were added to validate both standard and renderer-absent scenarios, and documentation was updated to align with release notes, resulting in more predictable and robust diagnostic workflows for developers.