Enhance convert_path_with_tilde_expansion to handle Windows (#4390)

ui/desktop/src/utils/pathUtils.ts

@@ -119,7 +119,18 @@ const addPaths = (
  * @returns The expanded path with tilde replaced by home directory
  */
 export function expandTilde(filePath: string): string {
+  if (!filePath || typeof filePath !== 'string') return filePath;
+  // Support "~", "~/..." and "~\\..." on Windows
+  if (filePath === '~') {
+    return os.homedir();
+  }
+  if (filePath.startsWith('~/') || (process.platform === 'win32' && filePath.startsWith('~\\'))) {
+    // Remove the leading "~" and any separator that follows, then join
+    const remainder = filePath.slice(2);
+    return path.join(os.homedir(), remainder);
+  }
   if (filePath.startsWith('~')) {
+    // Generic fallback: replace only the first leading tilde
     return path.join(os.homedir(), filePath.slice(1));
   }
   return filePath;