修复lint errors

src/contexts/color-mode/index.tsx

@@ -29,26 +29,20 @@ type ColorModeContextProviderProps = {
 export const ColorModeContextProvider: React.FC<
   PropsWithChildren<ColorModeContextProviderProps>
 > = ({ children, defaultMode }) => {
-  const [isMounted, setIsMounted] = useState(false);
-  const [mode, setMode] = useState(defaultMode || "light");
-
-  useEffect(() => {
-    setIsMounted(true);
-  }, []);
-
   const systemTheme = useMediaQuery(`(prefers-color-scheme: dark)`);
-
-  useEffect(() => {
-    if (isMounted) {
-      const theme = Cookies.get("theme") || (systemTheme ? "dark" : "light");
-      setMode(theme);
+  const [storedMode, setStoredMode] = useState<string | null>(() => {
+    if (typeof window === "undefined") {
+      return defaultMode ?? null;
     }
-  }, [isMounted, systemTheme]);
+
+    return Cookies.get("theme") || defaultMode || null;
+  });
+  const mode = storedMode || (systemTheme ? "dark" : "light");
 
   const toggleTheme = () => {
     const nextTheme = mode === "light" ? "dark" : "light";
 
-    setMode(nextTheme);
+    setStoredMode(nextTheme);
     Cookies.set("theme", nextTheme);
   };