refactor(filesystem): path joining logic creates double slashes

In packages/filesystem/utils.ts, the joinPath function adds a leading '/' to every path segment that doesn't already start with '/', which creates incorrect paths with double slashes like '//path1//path2' instead of '/path1/path2'. The logic incorrectly prepends '/' to values that already have it stripped.

Signed-off-by: tomaioo <203048277+tomaioo@users.noreply.github.com>

Author: tomaioo

packages/filesystem/utils.ts

@@ -5,7 +5,9 @@ export function joinPath(...paths: string[]): string {
       continue;
     }
     if (!value.startsWith("/")) {
-      value = `/${value}`;
+      if (path) {
+        value = `/${value}`;
+      }
     }
     if (value.endsWith("/")) {
       value = value.substring(0, value.length - 1);