Allow dim in theme colors

The faint attribute makes text recede on dark and light backgrounds
alike, without having to pick a gray for each. Let users use it in the
theme.

Some theme colors go through both GetTextStyle and GetGocuiStyle, so
both have to know it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs-master/Config.md

@@ -1017,6 +1017,7 @@ The available attributes are:
 
 - bold
 - default
+- dim # faint text; not supported by every terminal
 - reverse # useful for high-contrast
 - underline
 - strikethrough

pkg/theme/gocui.go

@@ -17,6 +17,7 @@ var gocuiColorMap = map[string]gocui.Attribute{
 	"cyan":          gocui.ColorCyan,
 	"white":         gocui.ColorWhite,
 	"bold":          gocui.AttrBold,
+	"dim":           gocui.AttrDim,
 	"reverse":       gocui.AttrReverse,
 	"underline":     gocui.AttrUnderline,
 	"strikethrough": gocui.AttrStrikeThrough,

pkg/theme/gocui_test.go

@@ -28,6 +28,11 @@ func TestGetGocuiStyle(t *testing.T) {
 			keys:     []string{"red", "strikethrough"},
 			expected: gocui.ColorRed | gocui.AttrStrikeThrough,
 		},
+		{
+			name:     "dim",
+			keys:     []string{"default", "dim"},
+			expected: gocui.ColorDefault | gocui.AttrDim,
+		},
 	}
 
 	for _, scenario := range scenarios {

pkg/theme/style.go

@@ -13,6 +13,8 @@ func GetTextStyle(keys []string, background bool) style.TextStyle {
 		switch key {
 		case "bold":
 			s = s.SetBold()
+		case "dim":
+			s = s.SetDim()
 		case "reverse":
 			s = s.SetReverse()
 		case "underline":

pkg/theme/style_test.go

@@ -39,6 +39,12 @@ func TestGetTextStyle(t *testing.T) {
 			background: false,
 			expected:   style.New().SetFg(style.NewRGBColor(color.RGBColor{0x12, 0x34, 0x56, 0})),
 		},
+		{
+			name:       "dim",
+			keys:       []string{"dim"},
+			background: false,
+			expected:   style.New().SetDim(),
+		},
 		{
 			name:       "hex color, bg",
 			keys:       []string{"#abcdef"},