Show posters as real images in kitty and Ghostty (Kitty graphics with Unicode placeholders)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/config/config.go

@@ -40,8 +40,11 @@ type UI struct {
 	// CoverStyle selects the block characters posters are drawn with:
 	// "quadrant" (2x2 pixels per cell, every font has the glyphs), "sextant"
 	// (2x3, sharper, needs a font with the Symbols for Legacy Computing
-	// block, e.g. kitty, WezTerm, foot, Ghostty) or "auto" (default: sextant
-	// on terminals known to draw them, quadrant elsewhere).
+	// block, e.g. kitty, WezTerm, foot, Ghostty), "kitty" (real images through
+	// the Kitty graphics protocol with Unicode placeholders: kitty and
+	// Ghostty) or "auto" (default: the Kitty protocol where the terminal is
+	// known to support it, else sextant on terminals known to draw them, else
+	// quadrant). The block styles are also the fallback for "kitty".
 	CoverStyle string `json:"cover_style,omitempty"`
 }
 
@@ -161,9 +164,9 @@ func (c *Config) Validate() error {
 		}
 	}
 	switch c.UI.CoverStyle {
-	case "", "auto", "quadrant", "sextant":
+	case "", "auto", "quadrant", "sextant", "kitty":
 	default:
-		errs = append(errs, fmt.Errorf(`ui.cover_style: %q must be "auto", "quadrant" or "sextant"`, c.UI.CoverStyle))
+		errs = append(errs, fmt.Errorf(`ui.cover_style: %q must be "auto", "kitty", "sextant" or "quadrant"`, c.UI.CoverStyle))
 	}
 	return errors.Join(errs...)
 }

internal/config/config_test.go

@@ -100,12 +100,12 @@ func TestShowCovers(t *testing.T) {
 
 func TestCoverStyleValidation(t *testing.T) {
 	base := `{"radarr":{"url":"http://r","apikey":"k"},"sonarr":{"url":"http://s","apikey":"k"},"sabnzbd":{"url":"http://a","apikey":"k"},"ui":{"cover_style":`
-	for _, ok := range []string{`"auto"`, `"quadrant"`, `"sextant"`, `""`} {
+	for _, ok := range []string{`"auto"`, `"quadrant"`, `"sextant"`, `"kitty"`, `""`} {
 		if _, err := Parse([]byte(base + ok + `}}`)); err != nil {
 			t.Errorf("%s rejected: %v", ok, err)
 		}
 	}
-	if _, err := Parse([]byte(base + `"braille"}}`)); err == nil {
+	if _, err := Parse([]byte(base + `"sixel"}}`)); err == nil {
 		t.Error("unknown style accepted")
 	}
 }