feat: dark modesupport

src/ThemeContext.jsx

@@ -0,0 +1,66 @@
+/* eslint-disable react-refresh/only-export-components */
+import { createContext, useContext, useState, useEffect } from "react";
+
+const ThemeContext = createContext();
+
+export function ThemeProvider({ children }) {
+  const [theme, setThemeState] = useState(() => {
+    try {
+      return localStorage.getItem("brew-theme") || "system";
+    } catch {
+      return "system";
+    }
+  });
+
+  const [resolvedTheme, setResolvedTheme] = useState("light");
+
+  const setTheme = (newTheme) => {
+    try {
+      localStorage.setItem("brew-theme", newTheme);
+    } catch (e) {
+      console.error("Failed to set theme in localStorage", e);
+    }
+    setThemeState(newTheme);
+  };
+
+  useEffect(() => {
+    const root = window.document.documentElement;
+    const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
+
+    const applyTheme = () => {
+      const isDark = theme === "dark" || (theme === "system" && mediaQuery.matches);
+      if (isDark) {
+        root.classList.add("dark");
+        setResolvedTheme("dark");
+      } else {
+        root.classList.remove("dark");
+        setResolvedTheme("light");
+      }
+    };
+
+    applyTheme();
+
+    const handleChange = () => {
+      if (theme === "system") {
+        applyTheme();
+      }
+    };
+
+    mediaQuery.addEventListener("change", handleChange);
+    return () => mediaQuery.removeEventListener("change", handleChange);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme, isDark: resolvedTheme === "dark" }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme() {
+  const context = useContext(ThemeContext);
+  if (!context) {
+    throw new Error("useTheme must be used within a ThemeProvider");
+  }
+  return context;
+}