[Webserver] Scrollbars always use light theme

[rd-danny-fleer]

What's the issue?

When choosing dark theme, scrollbars still use light theme (see the red boxes on the screenshot):

I tested this with the following setup:
dagster 1.8.13
Chrome Version 130.0.6723.117 (Official Build) (arm64)
macOS 15.1

Quick guess: The CSS property color-scheme is not correctly applied to the scrollbars.

What did you expect to happen?

Scrollbars should respect the theme settings, i.e. being dark when theme is set to dark.

How to reproduce?

• Set theme to use "dark"
• Open a run and verify the scrollbars use light theme

Dagster version

dagster, version 1.8.13

Deployment type

Local

Deployment details

No response

Additional information

No response

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