рефакторинг небольшой

src/Tool.zig

@@ -0,0 +1,11 @@
+const Point2_f = @import("models/basic_models.zig").Point2_f;
+const Canvas = @import("Canvas.zig");
+
+pub const ToolContext = struct {
+    canvas: *Canvas,
+    document_point: Point2_f,
+};
+
+pub const Tool = struct {
+    onCanvasClick: *const fn (*const ToolContext) void,
+};