fix(draw): drop now-redundant draw_dispatch import in the command test (T-318)

draw_commands.dart re-exports DrawingRegistry, so the direct import is
unnecessary; cleared the analyzer warning.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/daemon/draw_commands_test.dart

@@ -1,6 +1,5 @@
 import 'package:clide/clide.dart';
 import 'package:clide/src/daemon/draw_commands.dart';
-import 'package:clide/src/draw/draw_dispatch.dart';
 import 'package:test/test.dart';
 
 void main() {