Skip the navigation item if the parent group points to the same file

[reakaleek]

Closes #443

[Copilot]

PR Overview

This PR updates the navigation rendering logic in the _TocTreeNav.cshtml view so that a navigation item is skipped if its parent group points to the same file.

• Updated condition in the FileNavigation check to compare file names.

Reviewed Changes

File	Description
src/Elastic.Markdown/Slices/Layout/_TocTreeNav.cshtml	Modified the condition to skip a navigation item if its file name matches the parent index file name.

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/Elastic.Markdown/Slices/Layout/_TocTreeNav.cshtml:11

• [nitpick] The naming of the variable 'file' and its property 'File' can be confusing. Consider using more descriptive names to improve code clarity.

if (item is FileNavigation file && Model.SubTree.Index?.FileName != file.File.FileName)