feat(tauri): 添加文件修改时间查询命令

- 新增 get_file_mtime 命令
- 支持检测文件外部修改

packages/editor-app/src-tauri/src/commands/file_system.rs

@@ -254,6 +254,25 @@ pub fn read_file_as_base64(file_path: String) -> Result<String, String> {
     Ok(general_purpose::STANDARD.encode(&file_content))
 }
 
+/// Get file modification time (milliseconds since UNIX epoch)
+/// 获取文件修改时间（Unix 纪元以来的毫秒数）
+#[tauri::command]
+pub fn get_file_mtime(path: String) -> Result<u64, String> {
+    let metadata = fs::metadata(&path)
+        .map_err(|e| format!("Failed to get metadata for {}: {}", path, e))?;
+
+    let modified = metadata
+        .modified()
+        .map_err(|e| format!("Failed to get modified time for {}: {}", path, e))?;
+
+    let millis = modified
+        .duration_since(std::time::UNIX_EPOCH)
+        .map_err(|e| format!("Time error: {}", e))?
+        .as_millis() as u64;
+
+    Ok(millis)
+}
+
 /// Copy file from source to destination
 #[tauri::command]
 pub fn copy_file(src: String, dst: String) -> Result<(), String> {

packages/editor-app/src-tauri/src/main.rs

@@ -65,6 +65,7 @@ fn main() {
             commands::scan_directory,
             commands::read_file_as_base64,
             commands::copy_file,
+            commands::get_file_mtime,
             // Dialog operations
             commands::open_folder_dialog,
             commands::open_file_dialog,
@@ -183,18 +184,27 @@ fn handle_project_protocol(
 }
 
 /// Get MIME type based on file extension
+/// 根据文件扩展名获取 MIME 类型
 fn get_mime_type(file_path: &str) -> &'static str {
     if file_path.ends_with(".ts") || file_path.ends_with(".tsx") {
         "application/javascript"
-    } else if file_path.ends_with(".js") {
+    } else if file_path.ends_with(".js") || file_path.ends_with(".mjs") {
         "application/javascript"
     } else if file_path.ends_with(".json") {
         "application/json"
+    } else if file_path.ends_with(".wasm") {
+        "application/wasm"
     } else if file_path.ends_with(".css") {
         "text/css"
     } else if file_path.ends_with(".html") {
         "text/html"
+    } else if file_path.ends_with(".png") {
+        "image/png"
+    } else if file_path.ends_with(".jpg") || file_path.ends_with(".jpeg") {
+        "image/jpeg"
+    } else if file_path.ends_with(".svg") {
+        "image/svg+xml"
     } else {
-        "text/plain"
+        "application/octet-stream"
     }
 }