修复: UX扩展审查P0批(后端git/路径确定性bug + 前端UI + 编译阻断)

后端(src-tauri):

- project.rs: 4处空if目录校验补return Err(import/relocate/scan_directory/scan_project_with_ai),目录不存在不再静默放行

- ai/tools/git.rs: exec_git改返(String,bool)治git_commit·git_branch create/switch假成功 + git_merge补失败分支 + 加CREATE_NO_WINDOW

- module.rs: run_git_cmd加CREATE_NO_WINDOW,治Windows cmd黑窗闪烁(原问题9)

前端:

- DependencyGraph.vue: 环检测高亮注入renderGraph,原被fromJSON重建抹除致功能失效

- FileExplorer.vue: 工程下拉closeDropdown加closest判定,原打不开

附(预存编译阻断顺带修):

- df-nodes ai_node_helpers.rs: extract_first_json_object临时值借用悬垂E0716

- MessageList.vue: 删isLastUser死代码(vue-tsc TS6133)

审查产出: docs/05-代码审查/UIUX扩展审查-2026-08-02.md(80条发现,8高grep核验全属实)+ docs/todo.md批次段

src/components/project/FileExplorer.vue

@@ -360,8 +360,11 @@ function onChangeFileSelect(path: string) {
 
 watch(() => props.projectId, loadModules, { immediate: true })
 
-// 点击外部关闭工程下拉
-function closeDropdown() { moduleDropdownOpen.value = false }
+// 点击外部关闭工程下拉(点在 .module-dropdown 内不关,否则按钮 toggle 会被冒泡回调立即关闭)
+function closeDropdown(e: Event) {
+  if ((e.target as HTMLElement)?.closest('.module-dropdown')) return
+  moduleDropdownOpen.value = false
+}
 onMounted(() => document.addEventListener('click', closeDropdown))
 onUnmounted(() => document.removeEventListener('click', closeDropdown))