fix: sidebar type=file with data-context

[zoolsher]

Summary

The div.rspress-sidebar-item and the final Link component were initially implemented separately, causing certain cases to be overlooked, as shown in the test cases. Here's what I've done to address this issue:

1. Unified the implementation of div.rspress-sidebar-item and Link components to prevent any oversights.
2. Updated some test cases due to changes in the sidebar DOM structure.
3. Added test cases that correspond to the reproduced issue.

Related Issue

issue:#2202

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[JounQin]

Can you please open an issue/discussion first to describe what are you trying to resolve? I have no idea what you're doing, no summary, no related issue nor reference.

[zoolsher]

Can you please open an issue/discussion first to describe what are you trying to resolve? I have no idea what you're doing, no summary, no related issue or reference.

Certainly! I've created an issue and updated the summary for this pull request.

[SoonIter]

thanks ❤~