新增: Git 能力闭环(Diff 行号解析/分支只读展示/提交详情/写入后自动刷新变更视图)

- Diff 行号修复:解析 @@ -a,b +c,d @@ 头,计算旧/新行号(原恒空字符串)
- 提交详情增强:显示父提交哈希/作者/日期/完整消息(git show -s --format=%P\t%an)
- 分支只读展示:list_branches IPC + 变更面板顶部下拉查看分支(切换走 AI 工具)
- AI 工具写入后自动跳转变更视图:监听 df-data-changed entity=file 切 Tab + 刷新

src/components/project/FileExplorer.vue

@@ -181,6 +181,7 @@
  */
 import { ref, computed, watch, reactive, onMounted, onUnmounted } from 'vue'
 import { useI18n } from 'vue-i18n'
+import { listen, type UnlistenFn } from '@tauri-apps/api/event'
 import { moduleApi, type ProjectModuleRecord, type FileTreeEntry, type GitStatusResult } from '@/api/module'
 import FileTree from './FileTree.vue'
 import FilePreview from './FilePreview.vue'
@@ -364,6 +365,25 @@ function closeDropdown() { moduleDropdownOpen.value = false }
 onMounted(() => document.addEventListener('click', closeDropdown))
 onUnmounted(() => document.removeEventListener('click', closeDropdown))
 
+// AI 工具写入文件后(df-data-changed entity=file)自动跳转变更视图 + 刷新
+let _unlistenDataChanged: UnlistenFn | null = null
+onMounted(async () => {
+  _unlistenDataChanged = await listen<{ entity: string; action: string }>('df-data-changed', (e) => {
+    if (e.payload.entity !== 'file') return
+    // 刷新 git 状态缓存,使变更计数角标即时更新
+    gitStatusData.value = null
+    if (viewMode.value === 'changes') {
+      // 已在变更视图,触发 GitChanges 重新拉取(切一次 viewMode 触发 watch)
+      viewMode.value = 'tree'
+      viewMode.value = 'changes'
+    } else {
+      // 不在变更视图,自动切换到变更视图,让用户看到 AI 写入的内容
+      viewMode.value = 'changes'
+    }
+  })
+})
+onUnmounted(() => { _unlistenDataChanged?.() })
+
 // 自动扫描子仓库
 async function onScanSubmodules() {
   moduleDropdownOpen.value = false

src/components/project/FilePreview.vue

@@ -130,21 +130,36 @@ interface DiffLine {
   newNum: string
 }
 
+/** 解析 @@ -a,b +c,d @@ 头,返回旧/新行起始号 */
+function parseHunkHeader(line: string): { oldStart: number; newStart: number } {
+  // 格式: @@ -10,7 +10,8 @@
+  const m = line.match(/@@\s+-(\d+)(?:,\d+)?\s+\+(\d+)(?:,\d+)?\s+@@/)
+  if (!m) return { oldStart: 1, newStart: 1 }
+  return { oldStart: parseInt(m[1], 10), newStart: parseInt(m[2], 10) }
+}
+
 const diffLines = computed<DiffLine[]>(() => {
   if (!diffContent.value) return []
   const lines: DiffLine[] = []
+  let oldNum = 0
+  let newNum = 0
   for (const raw of diffContent.value.split('\n')) {
     if (raw.startsWith('@@')) {
+      const h = parseHunkHeader(raw)
+      oldNum = h.oldStart
+      newNum = h.newStart
       lines.push({ type: 'hdr', prefix: '', text: raw, oldNum: '', newNum: '' })
     } else if (raw.startsWith('+')) {
-      lines.push({ type: 'add', prefix: '+', text: raw.slice(1), oldNum: '', newNum: '' })
+      lines.push({ type: 'add', prefix: '+', text: raw.slice(1), oldNum: '', newNum: String(newNum++) })
     } else if (raw.startsWith('-')) {
-      lines.push({ type: 'del', prefix: '-', text: raw.slice(1), oldNum: '', newNum: '' })
+      lines.push({ type: 'del', prefix: '-', text: raw.slice(1), oldNum: String(oldNum++), newNum: '' })
     } else if (raw.startsWith('\\')) {
       // No newline at end of file 等元信息
       lines.push({ type: 'ctx', prefix: '', text: raw, oldNum: '', newNum: '' })
     } else {
-      lines.push({ type: 'ctx', prefix: ' ', text: raw, oldNum: '', newNum: '' })
+      // 空串(diff 头前的空行)或 context 行(以空格开头)
+      const text = raw.startsWith(' ') ? raw.slice(1) : raw
+      lines.push({ type: 'ctx', prefix: ' ', text, oldNum: String(oldNum++), newNum: String(newNum++) })
     }
   }
   return lines