✨ Enhance error handling and storage utilities

Improved error handling and updated storage utilities for better performance.

- ✨ **Feature**: Added custom error classes for return process errors
- 🛠️ **Refactor**: Updated hash function to handle strings and objects
- 🛠️ **Refactor**: Enhanced storage key generation with user context
- ⚙️ **Config**: Updated VSCode settings and package dependencies

.vscode/settings.json

@@ -91,5 +91,5 @@
     {
       "file": "docs/guidelines/testing.md"
     }
-  ]
+  ],
 }