test(table): assert wrapper div has 'relative' class

Adds a dedicated test to verify that the Table component renders its
wrapper div with class="relative w-full overflow-auto", ensuring
regression coverage for RUI-5.

Fixes: RUI-5

Author: djalmaaraujo

test/ruby_ui/table_test.rb

@@ -43,4 +43,12 @@ def test_render_with_all_items
 
     assert_match(/Total/, output)
   end
+
+  def test_render_table_wrapper_has_relative_class
+    output = phlex do
+      RubyUI.Table {}
+    end
+
+    assert_match(/class="relative w-full overflow-auto"/, output)
+  end
 end