feat: 月预览自定义悬停 tooltip, 月/周预览添加回到今日按钮

- MonthPreview: 用自定义 tooltip 替代原生 title 属性, 鼠标悬停事件
  即时显示详细信息 (标题/时间/地点/描述), 固定在右下角避免遮挡
- MonthPreview/WeekPreview: 工具栏新增回到今日按钮, 一键跳转回当天
- useCalendar: 新增 goToToday() action, 重置 previewDate 为今天

src/components/MonthPreview.vue

@@ -1,5 +1,5 @@
 <script setup>
-import { computed } from 'vue'
+import { ref, computed } from 'vue'
 import { useCalendar } from '../composables/useCalendar.js'
 import { expandOccurrences } from '../lib/recur.js'
 import { eventColor } from '../lib/colors.js'
@@ -8,11 +8,14 @@ import {
 } from '../lib/date.js'
 import { DOW } from '../lib/weekday.js'
 
-const { state, prevMonth, nextMonth } = useCalendar()
+const { state, prevMonth, nextMonth, goToToday } = useCalendar()
 
 // 表头: 周一~周日
 const headers = DOW.slice(1).concat(DOW[0])
 
+// 自定义 tooltip 状态
+const hoverEvent = ref(null)
+
 // 当前预览月的年月标签
 const monthLabel = computed(function () {
   const parts = parseISODate(startOfMonth(state.previewDate))
@@ -62,12 +65,12 @@ function colorStyle(uid) {
   }
 }
 
-function tooltip(ev) {
-  const parts = [ev.summary || '(无标题)']
-  parts.push(ev.dtstartTime + ' - ' + ev.dtendTime)
-  if (ev.location) parts.push('地点: ' + ev.location)
-  if (ev.description) parts.push('描述: ' + ev.description)
-  return parts.join('\n')
+function showTooltip(ev) {
+  hoverEvent.value = ev
+}
+
+function hideTooltip() {
+  hoverEvent.value = null
 }
 </script>
 
@@ -77,6 +80,7 @@ function tooltip(ev) {
       <button class="nav-btn" @click="prevMonth">上个月</button>
       <span class="month-label">{{ monthLabel }}</span>
       <button class="nav-btn" @click="nextMonth">下个月</button>
+      <button class="nav-btn today-btn" @click="goToToday">回到今日</button>
     </div>
     <div class="month-grid">
       <div v-for="h in headers" :key="h" class="grid-header">{{ h }}</div>
@@ -96,13 +100,21 @@ function tooltip(ev) {
             :key="occ.event.uid + occ.date"
             class="event-chip"
             :style="colorStyle(occ.event.uid)"
-            :title="tooltip(occ.event)"
+            @mouseenter="showTooltip(occ.event)"
+            @mouseleave="hideTooltip"
           >
             {{ occ.event.summary || '(无标题)' }}
           </div>
         </div>
       </div>
     </div>
+    <!-- 自定义 tooltip -->
+    <div v-if="hoverEvent" class="event-tooltip" @mouseenter="showTooltip(hoverEvent)" @mouseleave="hideTooltip">
+      <div class="tooltip-title">{{ hoverEvent.summary || '(无标题)' }}</div>
+      <div class="tooltip-row">时间: {{ hoverEvent.dtstartTime }} - {{ hoverEvent.dtendTime }}</div>
+      <div v-if="hoverEvent.location" class="tooltip-row">地点: {{ hoverEvent.location }}</div>
+      <div v-if="hoverEvent.description" class="tooltip-desc">{{ hoverEvent.description }}</div>
+    </div>
   </div>
 </template>
 
@@ -112,6 +124,7 @@ function tooltip(ev) {
   height: 100%;
   display: flex;
   flex-direction: column;
+  position: relative;
 }
 .preview-toolbar {
   display: flex;
@@ -130,6 +143,8 @@ function tooltip(ev) {
   color: #2c3e50;
 }
 .nav-btn:hover { background: #ecf0f1; }
+.today-btn { border-color: #3498db; color: #3498db; font-weight: 600; }
+.today-btn:hover { background: #eaf4fc; }
 .month-label {
   font-size: 16px;
   font-weight: 600;
@@ -200,4 +215,33 @@ function tooltip(ev) {
   text-overflow: ellipsis;
   cursor: default;
 }
+.event-tooltip {
+  position: fixed;
+  bottom: 16px;
+  right: 16px;
+  max-width: 320px;
+  background: #fff;
+  border: 1px solid #d5dbdb;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  padding: 12px 16px;
+  z-index: 100;
+  font-size: 13px;
+}
+.tooltip-title {
+  font-size: 14px;
+  font-weight: 700;
+  color: #2c3e50;
+  margin-bottom: 6px;
+}
+.tooltip-row {
+  color: #34495e;
+  margin-bottom: 3px;
+}
+.tooltip-desc {
+  color: #7f8c8d;
+  margin-top: 6px;
+  white-space: pre-wrap;
+  word-break: break-all;
+}
 </style>

src/components/WeekPreview.vue

@@ -8,7 +8,7 @@ import {
 } from '../lib/date.js'
 import { DOW } from '../lib/weekday.js'
 
-const { state, prevWeek, nextWeek } = useCalendar()
+const { state, prevWeek, nextWeek, goToToday } = useCalendar()
 
 const HOUR_HEIGHT = 48 // 每小时像素高度
 const headers = DOW.slice(1).concat(DOW[0]) // 周一..周日
@@ -113,6 +113,7 @@ function tooltip(ev) {
       <button class="nav-btn" @click="prevWeek">上一周</button>
       <span class="week-label">{{ weekLabel }}</span>
       <button class="nav-btn" @click="nextWeek">下一周</button>
+      <button class="nav-btn today-btn" @click="goToToday">回到今日</button>
     </div>
     <div class="week-grid-wrapper">
       <div class="week-grid">
@@ -177,6 +178,8 @@ function tooltip(ev) {
   color: #2c3e50;
 }
 .nav-btn:hover { background: #ecf0f1; }
+.today-btn { border-color: #3498db; color: #3498db; font-weight: 600; }
+.today-btn:hover { background: #eaf4fc; }
 .week-label {
   font-size: 16px;
   font-weight: 600;

src/composables/useCalendar.js

@@ -174,6 +174,10 @@ function nextWeek() {
   state.previewDate = addDays(state.previewDate, 7)
 }
 
+function goToToday() {
+  state.previewDate = todayISO()
+}
+
 // ------------------------------------------------------------------ //
 // 计算属性
 // ------------------------------------------------------------------ //
@@ -211,5 +215,6 @@ export function useCalendar() {
     nextMonth,
     prevWeek,
     nextWeek,
+    goToToday,
   }
 }