refactor(react19): replace Context.Provider with Context value={}

- 升级 6 个文件的 Context 语法为 React 19 标准
- ThemeProviderContext, ChartContext, AnimationContext, TourContext, AssetStoreContext, RestartContext
- 构建验证通过
- 功能完全等价

dashboard/src/components/theme-provider.tsx

@@ -90,8 +90,8 @@ export function ThemeProvider({
   )
 
   return (
-    <ThemeProviderContext.Provider value={value}>
+    <ThemeProviderContext value={value}>
       {children}
-    </ThemeProviderContext.Provider>
+    </ThemeProviderContext>
   )
 }