Refresh UI style to align with upcoming Firefox UI changes

[josh-berry]

Problem Statement

Firefox is updating its UI, particularly the sidebar styling. This styling change is coming alongside the work to implement native vertical tabs in Firefox. An early version of these changes can be seen in Firefox Nightly.

Preferred Solution(s)

Tab Stash should change its styling to match.

Alternative Solution(s)

No response

Additional Context

No response

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