feat: 拆分句子

form/index.css

@@ -270,6 +270,33 @@
   display: inline-block;
 }
 
+/* 分词表 - 悬浮行底边高亮与左侧拆分按钮 */
+.swords-table .el-table__body tr.sw-hover td {
+  border-bottom: 2px solid #409eff !important;
+}
+.swords-start-cell {
+  position: relative;
+}
+.row-split-trigger {
+  position: absolute;
+  left: -12px; /* 稍微伸出单元格左侧 */
+  bottom: -1px; /* 贴近行底边 */
+  width: 18px;
+  height: 18px;
+  border-radius: 50%;
+  background: #409eff;
+  color: #fff;
+  font-size: 12px;
+  line-height: 18px;
+  text-align: center;
+  box-shadow: 0 2px 6px rgba(64,158,255,0.35);
+  cursor: pointer;
+  user-select: none;
+}
+.row-split-trigger:hover {
+  background: #66b1ff;
+}
+
 /* 卡片悬停效果 */
 .upload-section,
 .video-section,

form/index.html

@@ -270,10 +270,30 @@
                   <div style="display:flex; gap:12px; margin-top:8px; flex-wrap:wrap;">
                     <div style="flex:1; min-width:300px;">
                       <div style="font-weight:500; margin-bottom:4px;">原文分词</div>
-                      <el-table :data="item.sWordsRef || []" size="mini" border>
+                      <el-table
+                        class="swords-table"
+                        :data="item.sWordsRef || []"
+                        size="mini"
+                        border
+                        :row-class-name="({row, rowIndex}) => getSWordsRowClass(item, idx, row, rowIndex)"
+                        @cell-mouse-enter="(row, column, cell, event) => onSWordsCellEnter(idx, row, column, cell, event)"
+                        @cell-mouse-leave="(row, column, cell, event) => onSWordsCellLeave(idx, row, column, cell, event)"
+                      >
                         <el-table-column label="start" width="90">
                           <template slot-scope="s">
+                            <div class="swords-start-cell">
                               {{ formatTimeNumeric(s.row.start) }}
+                              <el-tooltip
+                                v-if="item._hoveredSIndex === s.$index && !isAnyTaskRunning() && s.$index < (item.sWordsRef ? item.sWordsRef.length - 1 : 0)"
+                                content="在此处拆分为两句"
+                                placement="left"
+                              >
+                                <span
+                                  class="row-split-trigger"
+                                  @click="splitAtSWordsRow(idx, s.$index)"
+                                >拆</span>
+                              </el-tooltip>
+                            </div>
                           </template>
                         </el-table-column>
                         <el-table-column label="end" width="90">

form/index.js

@@ -735,9 +735,91 @@ function initVueApp(savedData) {
         }
         // 从可视列表中移除当前条目
         list.splice(idx, 1);
+        // 重新编号
+        list.forEach((it, i) => { it.index = i + 1; });
         this.$message.success('已与上一句合并');
       },
 
+      // hover 分词表行：进入/离开
+      onSWordsCellEnter(tlIndex, row, column, cell, event) {
+        const item = this.subtitleEditor.mergedList && this.subtitleEditor.mergedList[tlIndex];
+        if (!item || !Array.isArray(item.sWordsRef)) return;
+        const rIndex = item.sWordsRef.indexOf(row);
+        if (rIndex >= 0 && rIndex < item.sWordsRef.length - 1) {
+          this.$set(item, '_hoveredSIndex', rIndex);
+        } else {
+          this.$set(item, '_hoveredSIndex', -1);
+        }
+      },
+      onSWordsCellLeave(tlIndex, row, column, cell, event) {
+        const item = this.subtitleEditor.mergedList && this.subtitleEditor.mergedList[tlIndex];
+        if (!item) return;
+        this.$set(item, '_hoveredSIndex', -1);
+      },
+      getSWordsRowClass(item, tlIndex, row, rowIndex) {
+        if (!item || !Array.isArray(item.sWordsRef)) return '';
+        const isLast = rowIndex >= item.sWordsRef.length - 1;
+        return item._hoveredSIndex === rowIndex && !isLast ? 'sw-hover' : '';
+      },
+
+      // 在某个分词行底部拆分为两句
+      splitAtSWordsRow(tlIndex, rowIndex) {
+        if (this.isAnyTaskRunning && this.isAnyTaskRunning()) {
+          this.$message.warning('有任务进行中，拆分已锁定');
+          return;
+        }
+        const list = this.subtitleEditor.mergedList || [];
+        const item = list[tlIndex];
+        if (!item || !Array.isArray(item.sWordsRef)) return;
+        if (rowIndex < 0 || rowIndex >= item.sWordsRef.length - 1) {
+          this.$message.warning('请选择中间行进行拆分');
+          return;
+        }
+        const leftWords = item.sWordsRef.slice(0, rowIndex + 1);
+        const rightWords = item.sWordsRef.slice(rowIndex + 1);
+        const splitPointSec = this.parseTimeToSeconds(item.sWordsRef[rowIndex].end);
+        const nextStartSec = this.parseTimeToSeconds(item.sWordsRef[rowIndex + 1].start);
+        // 构造新条目
+        const newItem = {
+          index: item.index + 1,
+          sIndex: item.sIndex != null ? item.sIndex + 1 : null,
+          tIndex: item.tIndex != null ? item.tIndex + 1 : null,
+          start: this.toDisplayTime(nextStartSec),
+          end: item.end,
+          subtitleText: '',
+          subtitleWordString: '',
+          translatedText: '',
+          translatedTranslated: '',
+          translatedItemsString: '',
+          sWordsRef: rightWords,
+          tItemsRef: []
+        };
+        // 原条目更新为左半部分
+        item.sWordsRef = leftWords;
+        item.end = this.toDisplayTime(splitPointSec);
+        // 翻译分段按时间粗略分割
+        if (Array.isArray(item.tItemsRef)) {
+          const leftT = [];
+          const rightT = [];
+          for (const it of item.tItemsRef) {
+            const st = this.parseTimeToSeconds(it && it.start);
+            const et = this.parseTimeToSeconds(it && it.end);
+            if (!isNaN(et) && et <= splitPointSec) leftT.push(it);
+            else if (!isNaN(st) && st >= splitPointSec) rightT.push(it);
+            else {
+              // 交叉的分段归到后半部分，避免信息丢失
+              rightT.push(it);
+            }
+          }
+          item.tItemsRef = leftT;
+          newItem.tItemsRef = rightT;
+        }
+        // 插入新条目并重排索引
+        list.splice(tlIndex + 1, 0, newItem);
+        list.forEach((it, i) => { it.index = i + 1; });
+        this.$message.success('已按此处拆分为两句');
+      },
+
       // 从任意 JSON 中提取数组（优先常见字段，其次深度搜索）
       extractArrayFromJson(root, type) {
         if (!root) return [];