build: go 1.24

We were running behind and there were quite some deprecations to update.
This was mostly in the upstream copy/pasta package but seems quite
minimal.

vendor/github.com/charmbracelet/x/ansi/kitty/encoder.go

@@ -0,0 +1,64 @@
+package kitty
+
+import (
+	"compress/zlib"
+	"fmt"
+	"image"
+	"image/png"
+	"io"
+)
+
+// Encoder is an encoder for the Kitty graphics protocol. It supports encoding
+// images in the 24-bit [RGB], 32-bit [RGBA], and [PNG] formats, and
+// compressing the data using zlib.
+// The default format is 32-bit [RGBA].
+type Encoder struct {
+	// Uses zlib compression.
+	Compress bool
+
+	// Can be one of [RGBA], [RGB], or [PNG].
+	Format int
+}
+
+// Encode encodes the image data in the specified format and writes it to w.
+func (e *Encoder) Encode(w io.Writer, m image.Image) error {
+	if m == nil {
+		return nil
+	}
+
+	if e.Compress {
+		zw := zlib.NewWriter(w)
+		defer zw.Close() //nolint:errcheck
+		w = zw
+	}
+
+	if e.Format == 0 {
+		e.Format = RGBA
+	}
+
+	switch e.Format {
+	case RGBA, RGB:
+		bounds := m.Bounds()
+		for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+			for x := bounds.Min.X; x < bounds.Max.X; x++ {
+				r, g, b, a := m.At(x, y).RGBA()
+				switch e.Format {
+				case RGBA:
+					w.Write([]byte{byte(r >> 8), byte(g >> 8), byte(b >> 8), byte(a >> 8)}) //nolint:errcheck
+				case RGB:
+					w.Write([]byte{byte(r >> 8), byte(g >> 8), byte(b >> 8)}) //nolint:errcheck
+				}
+			}
+		}
+
+	case PNG:
+		if err := png.Encode(w, m); err != nil {
+			return fmt.Errorf("failed to encode PNG: %w", err)
+		}
+
+	default:
+		return fmt.Errorf("unsupported format: %d", e.Format)
+	}
+
+	return nil
+}