feat: add magic wand tool with settings and controls, including UI integration and functionality

input/tool-keybinds.ts

@@ -6,6 +6,7 @@ const toolKeybinds = {
   b: "brush",
   e: "eraser",
   k: "chromaKey",
+  w: "magicWand",
   p: "pan",
   s: "select",
 } as const;

input/transform-controls.ts

@@ -16,7 +16,7 @@ import type { PointerInputEvent } from "./pointer";
 
 type TransformHandle = "body" | "nw" | "n" | "ne" | "e" | "se" | "s" | "sw" | "w";
 
-type InputToolId = "select" | "brush" | "eraser" | "chromaKey" | "pan";
+type InputToolId = "select" | "brush" | "eraser" | "chromaKey" | "magicWand" | "pan";
 
 type InputInteractionMode =
   | { type: "tool"; tool: InputToolId }