Freight Timeline horizontal scroll not obvious/easy

[jessesuen]

Proposed Feature

The freight timeline may long. And so color indicators may stop showing up. e.g. in below example, the purple stages are not shown in the timeline:

The freight timeline is actually scrollable and users are expected to scroll to the right to see their old freight. But there is no easy way to scroll horizontally, unless:

• user uses trackpad to scroll
• user holds shift while scrolling with their mouse wheel
• user's mouse has a horizontal scrolling wheel

Motivation

I wanted to view the purple stages, but was not able to until I learned the trick about holding shift.

Suggested Implementation

@rbreeze suggested to making the scrollbar visible so that users can use drag and scroll.

[jessesuen]

https://github.com/akuity/kargo/issues/2386 could also address the issue if there is too much freight.

[rbreeze]

@jessesuen I'm not sure there's a way to accomplish this when users have the default "Show scrollbars = Automatically" setting enabled on a Mac. From the browser's perspective, the scrollbar is "always" there, but it's hidden because of the OS setting and there doesn't seem to be a way to override this via the browser.

When I set scrollbars to "Always",

this is how it appears:

Perhaps another way to always indicate scrollability is to add a small icon or message to the bottom right of the freight timeline?

[jessesuen]

Discussed with Remington and I suggested we add left/right arrow buttons in UI that would allow the freight timeline to scroll.