…alidators.handler.js

This PR updates the regex used for URL/deep link validation to handle a wider range of schemes, including:

* **Standard web protocols**: `http://`, `https://`, `ftp://`
* **Custom app deep links**: e.g. `com.example.app://action=authorization&hash=testKey&user=1`
* **Non-slash schemes**: e.g. `mailto:user@example.com`, `file:/Users/me/file.txt`

The new regex is:

```regex
^[a-zA-Z][a-zA-Z0-9.+-]*:(\/\/)?[^\s]+
```

---

### Motivation

Previously, the regex excluded common schemes (`http`, `https`, `ftp`) and only partially supported custom protocols. This caused valid links such as iOS deep links or `mailto:` addresses to be rejected.

By expanding the pattern:

* Developers can reliably validate both standard URLs and deep links.
* Edge cases like dotted custom schemes (`com.example.app`) and plus/minus variants (`custom+scheme-1`) are fully supported.
* Optional `//` handling ensures compatibility with schemes that do not use slashes.

---

### Examples

✅ **Now valid**:

* `http://example.com`
* `https://secure.com`
* `ftp://fileserver`
* `com.exaple.app://action=authorization&hash=testKey&user=1`
* `mailto:user@example.com`
* `file:/Users/me/file.txt`

❌ **Still invalid**:

* `://oops`
* `justastring`
* `123abc://test`

---

### Testing

* Added unit tests for all supported schemes and edge cases.
* Confirmed backwards compatibility for existing deep links.