fix: handle Windows file:// URL paths correctly

On Windows, URL.pathname returns paths like /D:/path which need the
leading slash removed to become valid Windows paths like D:/path

Author: azu

src/no-dead-link.ts

@@ -258,7 +258,14 @@ async function isAliveLocalFile(filePath: string): Promise<AliveFunctionReturn>
         let pathToCheck = filePath;
         if (filePath.startsWith("file://")) {
             const url = URL.parse(filePath);
-            pathToCheck = url ? url.pathname : filePath;
+            if (url && url.pathname) {
+                // On Windows, pathname starts with / for drive letters (e.g., /C:/path)
+                // We need to remove the leading slash for Windows paths
+                pathToCheck =
+                    process.platform === "win32" && url.pathname.match(/^\/[A-Za-z]:/)
+                        ? url.pathname.slice(1)
+                        : url.pathname;
+            }
         }
         await fs.access(pathToCheck.replace(/[?#].*?$/, ""));
         return {