fix(umbriel): reduce wallpaper bleed through translucent browsers

dot_config/umbriel/config.toml

@@ -84,9 +84,12 @@ corner_radius = 10
 enabled = false
 
 # Optimized blur samples only the wallpaper: cheaper than blurring the windows
-# behind each translucent surface.
+# behind each translucent surface. Strong enough that the wallpaper reads as
+# color, not shapes: Brave Origin paints its own translucent background, so
+# window opacity alone cannot hide what is behind it.
 [appearance.blur]
-radius = 3
+radius = 10
+passes = 4
 
 [appearance.tab_bar]
 hide_when_single = true