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/lib/restart-context.tsx

@@ -310,9 +310,9 @@ export function RestartProvider({
   }
 
   return (
-    <RestartContext.Provider value={contextValue}>
+    <RestartContext value={contextValue}>
       {children}
-    </RestartContext.Provider>
+    </RestartContext>
   )
 }