[Bug]: Toast notification background in dark themes

[kingtraceyj]

In dark themes, the low contrast toast notification often overlays the page header component. Both page header and notification use $layer-01. While the toast notification does have a drop shadow, the backgrounds still tend to blend together when using low contrast.

Possible explorations:

• Update dark themes to use $layer-02
• Update dropshadow
• Use borders (subtle or colored like inline low-constrast)

Current work around:
Use high contrast toast notification