fix(frontend): chart in `MkInstanceCardMini` is no longer displayed (#13932)

* fix(frontend): chart in `MkInstanceCardMini` is no longer displayed

* Update CHANGELOG.md

* test: add `MkInstanceCardMini` story

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

3 files changed, 67 insertions, 3 deletions

diff --git a/packages/frontend/src/components/MkChart.stories.impl.ts b/packages/frontend/src/components/MkChart.stories.impl.ts
index 6b0cc3b858..d1d17f6dc0 100644
--- a/packages/frontend/src/components/MkChart.stories.impl.ts
+++ b/packages/frontend/src/components/MkChart.stories.impl.ts
@@ -29,7 +29,7 @@ function getChartArray(seed: string, limit: number, option?: { accumulate?: bool
 	return array;
 }
 
-function getChartResolver(fields: string[], option?: { accumulate?: boolean, mulMap?: Record<string, number> }): HttpResponseResolver<PathParams, DefaultBodyType, JsonBodyType> {
+export function getChartResolver(fields: string[], option?: { accumulate?: boolean, mulMap?: Record<string, number> }): HttpResponseResolver<PathParams, DefaultBodyType, JsonBodyType> {
 	return ({ request }) => {
 		action(`GET ${request.url}`)();
 		const limitParam = new URL(request.url).searchParams.get('limit');
diff --git a/packages/frontend/src/components/MkInstanceCardMini.stories.impl.ts b/packages/frontend/src/components/MkInstanceCardMini.stories.impl.ts
new file mode 100644
index 0000000000..a069a0eb8e
--- /dev/null
+++ b/packages/frontend/src/components/MkInstanceCardMini.stories.impl.ts
@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/* eslint-disable @typescript-eslint/explicit-function-return-type */
+import { StoryObj } from '@storybook/vue3';
+import { HttpResponse, http } from 'msw';
+import { federationInstance } from '../../.storybook/fakes.js';
+import { commonHandlers } from '../../.storybook/mocks.js';
+import MkInstanceCardMini from './MkInstanceCardMini.vue';
+import { getChartResolver } from './MkChart.stories.impl.js';
+export const Default = {
+	render(args) {
+		return {
+			components: {
+				MkInstanceCardMini,
+			},
+			setup() {
+				return {
+					args,
+				};
+			},
+			computed: {
+				props() {
+					return {
+						...this.args,
+					};
+				},
+			},
+			template: '<MkInstanceCardMini v-bind="props" />',
+		};
+	},
+	args: {
+		instance: federationInstance(),
+	},
+	parameters: {
+		layout: 'centered',
+		msw: {
+			handlers: [
+				...commonHandlers,
+				http.get('/undefined/preview.webp', async ({ request }) => {
+					const urlStr = new URL(request.url).searchParams.get('url');
+					if (urlStr == null) {
+						return new HttpResponse(null, { status: 404 });
+					}
+					const url = new URL(urlStr);
+
+					if (url.href.startsWith('https://github.com/misskey-dev/misskey/blob/master/packages/frontend/assets/')) {
+						const image = await (await fetch(`client-assets/${url.pathname.split('/').pop()}`)).blob();
+						return new HttpResponse(image, {
+							headers: {
+								'Content-Type': 'image/jpeg',
+							},
+						});
+					} else {
+						return new HttpResponse(null, { status: 404 });
+					}
+				}),
+				http.get('/api/charts/instance', getChartResolver(['requests.received'])),
+			],
+		},
+	},
+} satisfies StoryObj<typeof MkInstanceCardMini>;
diff --git a/packages/frontend/src/components/MkInstanceCardMini.vue b/packages/frontend/src/components/MkInstanceCardMini.vue
index e26aef0f69..17c974dd04 100644
--- a/packages/frontend/src/components/MkInstanceCardMini.vue
+++ b/packages/frontend/src/components/MkInstanceCardMini.vue
@@ -29,8 +29,8 @@ const chartValues = ref<number[] | null>(null);
 
 misskeyApiGet('charts/instance', { host: props.instance.host, limit: 16 + 1, span: 'day' }).then(res => {
 	// 今日のぶんの値はまだ途中の値であり、それも含めると大抵の場合前日よりも下降しているようなグラフになってしまうため今日は弾く
-	res['requests.received'].splice(0, 1);
-	chartValues.value = res['requests.received'];
+	res.requests.received.splice(0, 1);
+	chartValues.value = res.requests.received;
 });
 
 function getInstanceIcon(instance): string {