Generate base css for web app

[MartinBspheroid]

Move away from hardcoded CSS by generating a dynamic stylesheet based on the current system theme and user preferences.

On initial load, determine the system theme (e.g., light/dark) and user preferences (e.g., font size, primary colors) to create and inject a base CSS file into the web app.
Provide a hook to allow users to change the theme and preferences dynamically, and re-generate the CSS as needed.

Ideas/Features:

• ✔️ Generate and inject base CSS on initial load.
• Allow users to update preferences through a hook (e.g., useThemePreferences).
• Ensure dynamic updates do not cause page flicker or reloading.
• Add support for saving preferences to localStorage or a similar mechanism for persistence.

[MartinBspheroid]

first point done, along with support for #10

✔️ Generate and inject base CSS on initial load

[orhun]

That looks good to me already!