Enhancement (Card Browser): Tap and drag scrollbar

[ShaanNarendran]

Purpose / Description

This change lets the user tap anywhere on the scrollbar to skip to that position in the list and continue dragging.

Fixes

• Fixes scrollbar should jump to clicked location #18520

How Has This Been Tested?

Screen_recording_20251230_183527.webm

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

smooth scrolling renders all rows between the current and target position.

You probably don't want this, we don't want dropped frames on this screen

[sanjaysargam]

oh ok understood!

[david-allison]

Implementation feels reasonable (heavy GCs, but that's somewhat expected as we're loading pages of results).

[david-allison]

Looks great, thanks!