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-tauri/src/commands/module.rs

@@ -467,13 +467,20 @@ fn run_git_cmd(cwd: &std::path::Path, args: &[&str], timeout: std::time::Duratio
     let cwd = cwd.to_path_buf();
     let args = args.iter().map(|s| s.to_string()).collect::<Vec<_>>();
     std::thread::spawn(move || {
-        let out = Command::new("git")
-            .args(&args)
+        let mut cmd = Command::new("git");
+        cmd.args(&args)
             .current_dir(&cwd)
             .env("LANG", "en_US.UTF-8")
             .env("LC_ALL", "en_US.UTF-8")
-            .env("GIT_PAGER", "cat")
-            .output();
+            .env("GIT_PAGER", "cat");
+        // Windows 下 spawn 子进程默认会弹 cmd 黑窗,加 CREATE_NO_WINDOW 抑制闪烁
+        // (GitChanges 挂载并发跑 rev-parse/status/log,不抑制会疯狂闪)。
+        #[cfg(windows)]
+        {
+            use std::os::windows::process::CommandExt;
+            cmd.creation_flags(0x0800_0000); // CREATE_NO_WINDOW
+        }
+        let out = cmd.output();
         let _ = tx.send(out);
     });