Followup to db10d595e7 Instead of doing a horizontal scrollbar for the theme light/dark screenshots, we want to show a toggle button with a sun/moon icon to switch between the two screenshots. Also, when you load the themes page, the screenshot type defaults to the user's current dark/light mode preference for the theme they are using. Finally, the light + dark screenshots for foundation have been updated since one had some artifacts at the edge. <img width="1024" height="640" alt="image" src="https://github.com/user-attachments/assets/7c79a4ec-b574-43ad-930e-013606d8d9f6" /> <img width="769" height="638" alt="image" src="https://github.com/user-attachments/assets/ce66f91f-60cb-4de3-b32c-3e60c0b27520" /> <img width="756" height="632" alt="image" src="https://github.com/user-attachments/assets/18a423ef-c317-4229-b84d-1ea93f04b124" />
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