Merge mocked keychain provider

Author: JunichiSugiura

packages/keychain/.storybook/preview.tsx

@@ -4,7 +4,7 @@ import { withThemeByClassName } from "@storybook/addon-themes";
 import { SonnerToaster } from "@cartridge/ui-next";
 
 import { StoryParameters, ParametersProvider } from "./parameters";
-import { Provider } from "./provider";
+import { Provider } from "#components/provider";
 
 import "../src/index.css";
 

packages/keychain/.storybook/provider.tsx

@@ -44,6 +44,8 @@ export const useConnectionValue: Mock<() => ConnectionContextValue> = fn(() => {
       provider: new RpcProvider({
         nodeUrl: "https://api.cartridge.gg/x/starknet/sepolia",
       }),
+      classHash: () =>
+        "0x0000000000000000000000000000000000000000000000000000000000000000",
       ...controller,
     } as Controller,
     origin: "http://localhost:3002",