🐛 [BUG] - provider network type accepts invalid testnet-staging type

[victorkl400]

Description

When the provider is passed a network type of "testnet-staging", the kit incorrectly falls back to "test" instead of throwing an error or failing validation as expected. The kit should reject unsupported network types rather than silently defaulting to a different value.

Reproduction URL

No response

Reproduction steps

1. Locate your implementation of `VechainKitProvider` in your codebase.  
2. Pass a custom network type (e.g., `"testnet-staging"`) and cast it to `NETWORK_TYPE`, as shown below:

   
   <VechainKitProvider
     network={{
       type: "testnet-staging" as NETWORK_TYPE,
     }}
   >
     {/* Your app components */}
   </VechainKitProvider>
   

3. Observe that the VeChain kit does not throw an error or fail validation.  
4. Instead, the kit incorrectly falls back to the `"test"` network when it should reject unsupported network types.

Screenshots

Logs

OS

No response