chore(client): tweak charts

packages/frontend/src/pages/user/activity.pv.vue

@@ -11,7 +11,6 @@
 <script lang="ts" setup>
 import { markRaw, version as vueVersion, onMounted, onBeforeUnmount, nextTick } from 'vue';
 import { Chart } from 'chart.js';
-import { enUS } from 'date-fns/locale';
 import tinycolor from 'tinycolor2';
 import * as misskey from 'misskey-js';
 import gradient from 'chartjs-plugin-gradient';
@@ -113,6 +112,10 @@ async function renderChart() {
 					time: {
 						stepSize: 1,
 						unit: 'day',
+						displayFormats: {
+							day: 'M/d',
+							month: 'Y/M',
+						},
 					},
 					grid: {
 						display: false,
@@ -122,11 +125,6 @@ async function renderChart() {
 						maxRotation: 0,
 						autoSkipPadding: 8,
 					},
-					adapters: {
-						date: {
-							locale: enUS,
-						},
-					},
 				},
 				y: {
 					position: 'left',