refactor: Update Widget Measurement System and Toolbar Layout

- Refactored the toolbar layout in Toolset to enhance compactness and usability, adjusting padding and button sizes for better alignment.
- Introduced a new WidgetMeasurement class to track widget dimensions, improving debugging and test automation capabilities.
- Updated CMake configuration to reflect the new file structure for widget measurement components, ensuring proper integration.

src/app/gui/editor_layout.h

@@ -77,6 +77,7 @@ class Toolset {
   bool in_section_ = false;
   int button_count_ = 0;
   float current_line_width_ = 0.0f;
+  float mode_group_button_size_ = 0.0f;
 };
 
 /**