Dark mode / light theme switching support

Feature Request: Enable Dark/Light Mode Sync for Embedded OpnForms

Currently, OpnForms does not support automatic synchronization with the dark/light mode preferences of websites where forms are embedded. This creates a frustrating mismatch for users who have intentionally chosen a specific theme. For example:

• A light-colored form appears on a website with a dark theme.

• A dark-colored form is displayed on a website using a light theme.

This inconsistency disrupts the user experience and can feel unpolished, leaving visitors dissatisfied—especially those who prefer a seamless visual experience that aligns with their chosen mode.

I propose introducing functionality that allows embedded OpnForms to dynamically adjust their color theme based on the website visitor’s preference. This would ensure a cohesive appearance, improve usability, and enhance the overall user experience for both site owners and their audiences.

The functionality actually appears to exist as they have setup light / dark classes but even support can’t get this to work, so is perhaps a bug.