fix: 修复 React Compiler 严格模式下的 lint 错误

- Memorize: 将 loadCards 内联到 useEffect 中避免变量提升问题
- DecksClient: 修复 effect 中异步加载，创建 deck 后使用 actionGetDeckById
- LanguageSettings: 使用 effect 设置 cookie 避免 render 期间修改
- theme-provider: 修复 hydration 逻辑避免 render 期间访问 ref

src/components/theme-provider.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { createContext, useContext, useEffect, useState } from "react";
+import { createContext, useContext, useEffect, useState, useMemo } from "react";
 import {
   THEME_PRESETS,
   DEFAULT_THEME,
@@ -20,26 +20,33 @@ const ThemeContext = createContext<ThemeContextType | null>(null);
 
 const STORAGE_KEY = "theme-preset";
 
+function getInitialTheme(): string {
+  if (typeof window === "undefined") return DEFAULT_THEME;
+  const saved = localStorage.getItem(STORAGE_KEY);
+  return saved && getThemePreset(saved) ? saved : DEFAULT_THEME;
+}
+
 export function ThemeProvider({ children }: { children: React.ReactNode }) {
   const [currentTheme, setCurrentTheme] = useState<string>(DEFAULT_THEME);
-  const [mounted, setMounted] = useState(false);
+  const [hydrated, setHydrated] = useState(false);
 
   useEffect(() => {
-    setMounted(true);
-    const savedTheme = localStorage.getItem(STORAGE_KEY);
-    if (savedTheme && getThemePreset(savedTheme)) {
+    const savedTheme = getInitialTheme();
+    if (savedTheme !== currentTheme) {
       setCurrentTheme(savedTheme);
     }
+    setHydrated(true);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
   useEffect(() => {
-    if (!mounted) return;
+    if (!hydrated) return;
     const preset = getThemePreset(currentTheme);
     if (preset) {
       applyThemeColors(preset);
       localStorage.setItem(STORAGE_KEY, currentTheme);
     }
-  }, [currentTheme, mounted]);
+  }, [currentTheme, hydrated]);
 
   const setTheme = (themeId: string) => {
     if (getThemePreset(themeId)) {
@@ -47,11 +54,7 @@ export function ThemeProvider({ children }: { children: React.ReactNode }) {
     }
   };
 
-  const themePreset = getThemePreset(currentTheme) || THEME_PRESETS[0];
-
-  if (!mounted) {
-    return null;
-  }
+  const themePreset = useMemo(() => getThemePreset(currentTheme) || THEME_PRESETS[0], [currentTheme]);
 
   return (
     <ThemeContext.Provider