Default WPF ToolTip is cream-on-black with a thin 3D border — looks like a Win98 popup on the dark canvas. The app has dozens of tooltips on settings controls, header pills, IN-CALL bar, and per-row toggles — every one was previously rendering as the OS default.
New style: SurfaceElevated background, BorderStrong border, rounded 6px corner, monospace-friendly text wrapping at 320px so a verbose explanation doesn't stretch across the whole monitor.
Implementation note: ContentPresenter doesn't accept TextBlock.TextWrapping as an attached property — used a templated TextBlock bound directly to Content instead (every tooltip in the app passes a plain string).