Describe the bug
Most of the examples in raygui do not adapt correctly to HiDPI (Retina/4K) displays. On such displays, GUI elements appear bigger than intended.

To Reproduce
Steps to reproduce the behavior:

1. Compile any example, e.g., controls_test_suite.c.
2. Run it on a HiDPI monitor.
3. Observe that GUI elements are scaled incorrectly.

Suggested fix
Add the following line before InitWindow in each example .c file:

SetConfigFlags(FLAG_WINDOW_HIGHDPI);

This ensures that GUI elements are scaled properly on HiDPI displays, preventing confusion for new users who might otherwise see overly large or mis-scaled UI when first running the examples.