feat: 自动保存/移除撤销与红点, 间隔合并改进(DAILY/稀疏/交错拆分), 删死代码, 更新测试与文档

- organize: seriesKey 移除 weekday, 解锁每3天等 DAILY 序列合并
- organize: fitSeries 放宽阈值(稀疏序列如 BUS LAW Workshop 合并)
- organize: 新增 splitIntoChains, GCD=1 的交错多班次拆为多个系列
- useCalendar: 移除 dirty/history/undo/snapshot/markSaved 死代码
- HeaderBar: 移除撤销按钮与红点●, 下载兜底序列化当前状态
- 测试: 42 项(原32), 覆盖 DAILY/稀疏/交错拆分/两两和候选等场景
- 文档: README 精简, 新增 docs/organize-algorithm.md 与 auto-save-design.md
- 保留移动端 CSS 适配

src/components/DropZone.vue

@@ -91,4 +91,10 @@ function onPick(e) {
   font-size: 13px;
   margin-top: 16px;
 }
+
+@media (max-width: 768px) {
+  .dropzone { margin: 16px; border-radius: 8px; }
+  .hint { font-size: 13px; }
+  .pick-btn { padding: 8px 20px; font-size: 13px; }
+}
 </style>

src/components/EventDetail.vue

@@ -263,4 +263,11 @@ function onToggleOcc(date) {
 }
 .split-panel p { width: 100%; font-size: 13px; color: #7f8c8d; margin-bottom: 8px; }
 .split-panel input { padding: 6px 10px; border: 1px solid #d5dbdb; border-radius: 6px; }
+
+@media (max-width: 768px) {
+  .detail { padding: 16px; }
+  .form-row { flex-direction: column; gap: 0; }
+  .toolbar { flex-wrap: wrap; }
+  .btn { padding: 6px 12px; font-size: 12px; }
+}
 </style>

src/components/EventList.vue

@@ -84,4 +84,13 @@ function dowFor(ev) {
 }
 .badge-recur { background: #e8f5e9; color: #2e7d32; }
 .badge-single { background: #fff3e0; color: #e65100; }
+
+@media (max-width: 768px) {
+  .event-list {
+    width: 100%;
+    max-height: 40vh;
+    border-right: none;
+    border-bottom: 1px solid #e0e3e6;
+  }
+}
 </style>

src/components/HeaderBar.vue

@@ -2,7 +2,7 @@
 import { useCalendar } from '../composables/useCalendar.js'
 import { ref } from 'vue'
 
-const { state, canUndo, organize, undo, serialize, markSaved, loadFile } = useCalendar()
+const { state, organize, serialize, loadFile } = useCalendar()
 const fileInput = ref(null)
 
 function onOrganize() {
@@ -24,7 +24,7 @@ function onFilePicked(e) {
 }
 
 function onDownload() {
-  if (state.dirty && !confirm('有未保存的更改，仍要下载？')) return
+  // 兜底自动保存: 始终序列化当前最新状态 (所有编辑已即时生效)
   const text = serialize()
   const blob = new Blob([text], { type: 'text/calendar' })
   const url = URL.createObjectURL(blob)
@@ -34,7 +34,6 @@ function onDownload() {
   a.download = base + '.edited.ics'
   a.click()
   URL.revokeObjectURL(url)
-  markSaved()
 }
 </script>
 
@@ -43,18 +42,16 @@ function onDownload() {
     <button class="btn btn-primary" @click="onOrganize" :disabled="state.events.length === 0">
       整理去重
     </button>
-    <button class="btn btn-secondary" @click="undo" :disabled="!canUndo">撤销</button>
     <button class="btn btn-secondary" @click="onImport">导入文件</button>
     <button class="btn btn-success" @click="onDownload" :disabled="state.events.length === 0">
       下载 ICS
     </button>
-    <span v-if="state.dirty" class="dirty-dot" title="有未保存更改">●</span>
     <input ref="fileInput" type="file" accept=".ics" @change="onFilePicked" hidden />
   </div>
 </template>
 
 <style scoped>
-.header-actions { display: flex; gap: 10px; align-items: center; }
+.header-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; justify-content: center; }
 .btn {
   padding: 7px 16px;
   border: none;
@@ -63,6 +60,7 @@ function onDownload() {
   font-size: 13px;
   font-weight: 500;
   transition: background 0.15s;
+  white-space: nowrap;
 }
 .btn:disabled { opacity: 0.5; cursor: not-allowed; }
 .btn-primary { background: #3498db; color: #fff; }
@@ -71,5 +69,9 @@ function onDownload() {
 .btn-success:hover:not(:disabled) { background: #229954; }
 .btn-secondary { background: #ecf0f1; color: #2c3e50; }
 .btn-secondary:hover:not(:disabled) { background: #d5dbdb; }
-.dirty-dot { color: #e74c3c; font-size: 16px; }
+
+@media (max-width: 768px) {
+  .header-actions { gap: 6px; }
+  .btn { padding: 5px 10px; font-size: 12px; }
+}
 </style>

src/components/MonthPreview.vue

@@ -244,4 +244,16 @@ function hideTooltip() {
   white-space: pre-wrap;
   word-break: break-all;
 }
+
+@media (max-width: 768px) {
+  .month-preview { padding: 10px 8px; }
+  .preview-toolbar { gap: 8px; flex-wrap: wrap; }
+  .nav-btn { padding: 4px 10px; font-size: 12px; }
+  .month-label { font-size: 14px; min-width: 100px; }
+  .grid-header { font-size: 11px; padding: 5px 0; }
+  .grid-cell { padding: 2px 3px; }
+  .day-num { font-size: 11px; }
+  .event-chip { font-size: 9px; padding: 0 3px; }
+  .event-tooltip { max-width: calc(100vw - 32px); bottom: 8px; right: 8px; left: 8px; }
+}
 </style>

src/components/WeekPreview.vue

@@ -268,4 +268,20 @@ function tooltip(ev) {
   font-size: 10px;
   opacity: 0.8;
 }
+
+@media (max-width: 768px) {
+  .week-preview { padding: 10px 4px; }
+  .preview-toolbar { gap: 8px; flex-wrap: wrap; }
+  .nav-btn { padding: 4px 10px; font-size: 12px; }
+  .week-label { font-size: 13px; min-width: 140px; }
+  .week-grid { min-width: 600px; }
+  .time-col { width: 40px; }
+  .time-slot { font-size: 10px; padding-right: 3px; }
+  .day-header { font-size: 10px; height: 34px; }
+  .day-date { font-size: 12px; }
+  .time-spacer { height: 34px; }
+  .event-block { font-size: 10px; padding: 1px 2px; }
+  .event-title { font-size: 10px; }
+  .event-time { font-size: 9px; }
+}
 </style>