PC3: style updates and improved behavior

Noah Davisrequested to merge
work/ndavis/plasma-theme-update into master

The TabBar and TabButton changes are needed for plasma-pa!86 (merged)

Screenshot_20211005_014738 Screenshot_20211005_014830 Screenshot_20211005_014915 Screenshot_20211005_015051 Screenshot_20211005_015114 Screenshot_20211005_015134 Screenshot_20211005_015222 Screenshot_20211005_015324

@teams/vdg

BUG: 355889

Edited by Noah Davis

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