рефакторинг небольшой

src/Canvas.zig

@@ -8,7 +8,7 @@ const Rect_i = basic_models.Rect_i;
 const Size_i = basic_models.Size_i;
 const Point2_f = @import("models/basic_models.zig").Point2_f;
 const Color = dvui.Color;
-
+const tools = @import("tools.zig");
 const Toolbar = @import("Toolbar.zig");
 const Canvas = @This();
 
@@ -29,15 +29,14 @@ _zoom: f32 = 1,
 _redraw_pending: bool = false,
 _last_redraw_time_ms: i64 = 0,
 cursor_document_point: ?Point2_f = null,
-/// true — рисовать документ (render), false — пример (gradient/squares).
 draw_document: bool = true,
 
-pub fn init(allocator: std.mem.Allocator, document: *Document, engine: RenderEngine, toolbar: Toolbar) Canvas {
+pub fn init(allocator: std.mem.Allocator, document: *Document, engine: RenderEngine) Canvas {
     return .{
         .allocator = allocator,
         .document = document,
         .render_engine = engine,
-        .toolbar = toolbar,
+        .toolbar = Toolbar.init(&tools.default_tools),
     };
 }