Add inline-start border to filters on desktop

[obulat]

Fixes

Fixes #729 by @panchovm

Description

This PR adds a border to the left (in LTR, and right in RTL) side of the filter sidebar on desktop screen. To be honest, with my settings for scrollbar visibility, it is not easy to see:

Testing Instructions

Run the app, and open the filters sidebar. You should see a border between the sidebar and the main content.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[obulat]

Screenshot after changing the scrollbar properties and setting the locale direction to RTL

[dhruvkb]

Great implementation. Minor code style nitpick. Approving to unblock.

[fcoveram]

It looks great ✨

To be honest, with my settings for scrollbar visibility, it is not easy to see

Same to me when scrolling, but the section division is visible once the scroll bar disappears. Many people have different settings where the scrolling effect looks unalike.

[obulat]

Great implementation. Minor code style nitpick. Approving to unblock.

Thank you, @dhruvkb , I wasn't aware of the @screen option!

[fcoveram]

Great work ✨