fix: width & height issue on retina screens

[sixfourtwelve]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes a rendering issue on high-DPI (retina) screens by updating r_window_get_vsize() to use the actual framebuffer size instead of window parameters. On retina displays, the framebuffer dimensions are typically 2x the window size in screen coordinates, and this change ensures correct rendering dimensions are returned.

Key Changes:

• Modified r_window_get_vsize() to query framebuffer size directly via glfwGetFramebufferSize() instead of reading cached window parameters
• This ensures the function returns pixel dimensions of the actual rendering surface, which differ from window coordinates on high-DPI displays

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.