Bigger font and plate, tighter gap between tabs, taller tabs for real
vertical padding around the label. Selection now relies on Blizzard's
own white-text-on-checked behaviour instead of an ElvUI border/fill
swap, matching the Friends/Character tab rows elsewhere in ElvUI.
Growth and frame-level bump are self-healing from the tabs' OnUpdate
hook rather than one-shot: the tab's native height isn't settled yet
when it's first skinned, and something outside our control resets the
frame level on a plain tab switch, so both need to keep correcting
themselves rather than being set once behind a guard.
Narcasung
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