Fix _is_writable_sync Windows compatibility (NotImplementedError) (#179)

- Catch NotImplementedError as the primary fallback since os.access(..., effective_ids=True) is not implemented on Windows
- Also catch AttributeError, OSError, and TypeError as supplementary guards
- Prevents crashes when checking file writability on Windows platforms, primarily fixing directory listing operations (/files/list, stat, listdir)

Fixes #174

open_terminal/utils/fs.py

@@ -192,7 +192,7 @@ class UserFS:
             pass
         try:
             return os.access(path, os.W_OK, effective_ids=True)
-        except TypeError:
+        except (TypeError, OSError, NotImplementedError, AttributeError):
             return os.access(path, os.W_OK)
 
     async def is_writable(self, path: str) -> bool: