Update Wintergreen theme to use new API

internal/theme/default/default.go

@@ -1,19 +1,19 @@
 package defaultTheme
 
 import "image/color"
-import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/tomo"
 import dataTheme "git.tebibyte.media/tomo/nasin/internal/theme"
 
-// Theme returns Wintergreen, the default Tomo theme. It is neutral-gray with
+// Theme returns Wintergreen, the default Tomo tomo. It is neutral-gray with
 // green and turquoise accents.
-func Theme () theme.Theme {
+func Theme () tomo.Theme {
 	return &dataTheme.Theme {
-		Colors: map[theme.Color] color.Color {
+		Colors: map[tomo.Color] color.Color {
-			theme.ColorBackground: colorBackground,
+			tomo.ColorBackground: colorBackground,
-			theme.ColorForeground: colorForeground,
+			tomo.ColorForeground: colorForeground,
-			theme.ColorRaised:     colorCarved,
+			tomo.ColorRaised:     colorCarved,
-			theme.ColorSunken:     colorCarved,
+			tomo.ColorSunken:     colorCarved,
-			theme.ColorAccent:     colorFocus,
+			tomo.ColorAccent:     colorFocus,
 		},
 		Rules: rules,
 		IconTheme: &iconTheme { },

internal/theme/default/icon.go

@@ -6,7 +6,6 @@ import _ "embed"
 import _ "image/png"
 import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/tomo/data"
-import "git.tebibyte.media/tomo/tomo/theme"
 import "git.tebibyte.media/tomo/tomo/canvas"
 
 //go:embed assets/icons-small.png