Add Bubble Tea TUI with interactive treemap

Cell canvas renderer with frame cache and a perceptual 256-colour
quantizer; responsive geometry (large/medium/small/too-small);
squarified treemap with nested previews, LOD grouping, category
colouring and adaptive labels; spatial arrow navigation with stable
NodeID selection; zoom and breadcrumbs; modal system (info, help,
confirm, save); list, file-type, top-N, scan-info, duplicate and
comparison views; live search/filter; mouse support; move-to-trash.

internal/platform/ops_darwin.go

@@ -0,0 +1,72 @@
+package platform
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// TrashName is the user-facing name of the trash.
+const TrashName = "Trash"
+
+// Reveal selects the item in Finder.
+func Reveal(path string) error {
+	if err := checkAbs(path); err != nil {
+		return err
+	}
+	return startDetached("open", "-R", path)
+}
+
+// Trash moves path into ~/.Trash (same volume) or the volume's
+// .Trashes/<uid> directory. It never copies and never deletes.
+func Trash(path string) error {
+	if err := checkAbs(path); err != nil {
+		return err
+	}
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return err
+	}
+	dirs := []string{filepath.Join(home, ".Trash")}
+	if vol := volumeOf(path); vol != "" {
+		dirs = append(dirs, filepath.Join(vol, ".Trashes", fmt.Sprint(os.Getuid())))
+	}
+	base := filepath.Base(path)
+	for _, dir := range dirs {
+		if err := os.MkdirAll(dir, 0o700); err != nil {
+			continue
+		}
+		for i := 1; i < 10000; i++ {
+			name := base
+			if i > 1 {
+				name = fmt.Sprintf("%s %d", base, i)
+			}
+			dst := filepath.Join(dir, name)
+			if _, err := os.Lstat(dst); err == nil {
+				continue
+			}
+			err := os.Rename(path, dst)
+			if errors.Is(err, syscall.EXDEV) {
+				break // try the next trash location
+			}
+			return err
+		}
+	}
+	return errors.New("trash: item is on a volume without a usable trash")
+}
+
+func volumeOf(path string) string {
+	const prefix = "/Volumes/"
+	if len(path) > len(prefix) && path[:len(prefix)] == prefix {
+		rest := path[len(prefix):]
+		for i := 0; i < len(rest); i++ {
+			if rest[i] == '/' {
+				return prefix + rest[:i]
+			}
+		}
+		return path
+	}
+	return ""
+}