Add whitebox selection mode and update brushes.ts

src/core/whitebox-selection-mode.ts

@@ -0,0 +1,14 @@
+export const WHITEBOX_SELECTION_MODES = ["object", "face", "edge", "vertex"] as const;
+
+export type WhiteboxSelectionMode = (typeof WHITEBOX_SELECTION_MODES)[number];
+
+export const WHITEBOX_SELECTION_MODE_LABELS: Record<WhiteboxSelectionMode, string> = {
+  object: "Object",
+  face: "Face",
+  edge: "Edge",
+  vertex: "Vertex"
+};
+
+export function getWhiteboxSelectionModeLabel(mode: WhiteboxSelectionMode): string {
+  return WHITEBOX_SELECTION_MODE_LABELS[mode];
+}