React

frontend/src/context/ThemeContext.tsx

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+import type React from "react";
+import { createContext, type ReactNode, useContext, useEffect, useState } from "react";
+
+const StorageKey = "tabler-theme";
+export const Light = "light";
+export const Dark = "dark";
+
+// Define theme types
+export type Theme = "light" | "dark";
+
+interface ThemeContextType {
+	theme: Theme;
+	toggleTheme: () => void;
+	setTheme: (theme: Theme) => void;
+	getTheme: () => Theme;
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+interface ThemeProviderProps {
+	children: ReactNode;
+}
+
+const getBrowserDefault = (): Theme => {
+	if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
+		return Dark;
+	}
+	return Light;
+};
+
+export const ThemeProvider: React.FC<ThemeProviderProps> = ({ children }) => {
+	const [theme, setThemeState] = useState<Theme>(() => {
+		// Try to read theme from localStorage or use 'light' as default
+		if (typeof window !== "undefined") {
+			const stored = localStorage.getItem(StorageKey) as Theme | null;
+			return stored || getBrowserDefault();
+		}
+		return getBrowserDefault();
+	});
+
+	useEffect(() => {
+		document.body.dataset.theme = theme;
+		localStorage.setItem(StorageKey, theme);
+	}, [theme]);
+
+	const toggleTheme = () => {
+		setThemeState((prev) => (prev === Light ? Dark : Light));
+	};
+
+	const setTheme = (newTheme: Theme) => {
+		setThemeState(newTheme);
+	};
+
+	const getTheme = () => {
+		return theme;
+	}
+
+	document.documentElement.setAttribute("data-bs-theme", theme);
+	return <ThemeContext.Provider value={{ theme, toggleTheme, setTheme, getTheme }}>{children}</ThemeContext.Provider>;
+};
+
+export function useTheme(): ThemeContextType {
+	const context = useContext(ThemeContext);
+	if (!context) {
+		throw new Error("useTheme must be used within a ThemeProvider");
+	}
+	return context;
+}