fix-140: Add Z-Index to Scrollbar Rail Wrappers

[it-tma-tri]

Summary by Sourcery

This pull request addresses a bug by adding a z-index to the scrollbar rail wrappers in the schedule view to ensure they are displayed correctly in the stacking order.

• Bug Fixes:
  • Added z-index to scrollbar rail wrappers to ensure proper stacking order.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses issue #140 by adding a z-index property to the scrollbar rail wrappers within the schedule view. The change ensures that the scrollbar rails are properly layered above other elements, improving the user interface and interaction.

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[sourcery-ai]

Hey @it-tma-tri - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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