Fix type inference for `createInjectable` with default values

[LcsGa]

Steps to Reproduce

1. Create an injectable using either createInjectable or createInjectable.root
2. Declare optional parameters with default values, such as: const [injectFn, provideFn] = createInjectable('BaseUrl', (baseUrl = 'https://...') => baseUrl);

Expected Behavior

• The return type of injectFn should be inferred based on the default value's type: in the example above, it should be typed as string
• The expected argument type for provideFn should be inferred based on the default value's type: it should accept baseUrl?: string

Actual Behavior

• The return type of injectFn is any
• provideFn expects baseUrl?: any

Signality version

0.3.0

Angular version

=20

Browser

None

Operating system

None

Additional Context

To completely resolve this type inference issue, I decided to stop enforcing optional arguments for createInjectable.root.

While enforcing this would have been safer at compile time (to prevent errors if the resulting injectable is never explicitly provided with arguments), it made fixing the type inference highly complex. The workaround required returning never instead of CreateInjectableRef if at least one parameter was required.

Although this approach worked, the typing lost its consistency with createInjectable and became quite difficult to read. Therefore, I chose to drop this strict constraint and instead rely on developers to be mindful of this specific case when using the utility.

I will add a warning about this behavior in the documentation.