Allow to prefill the login form

[lukasbestle]

Main use case for me is to make it easier to log in to the Demokit. We could also use it in the Sandbox.

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This PR …

Enhancements

• The login form can now be prefilled for testing use cases with the new value prop of the k-login-view component

Breaking changes

None

Docs

Probably too obscure to document

Ready?

• In-code documentation (wherever needed)
• Unit tests for fixed bug/feature
• Tests and checks all pass

For review team

• Add lab and/or sandbox examples (wherever helpful)
• Add changes & docs to release notes draft in Notion

[distantnative]

I'd suggest to just calling them email and password.

And let's avoid v-bind=$propd - that'll cause issues down the road with Vue 3. already looking into how to reduce this in our existing code (so totally get why you added it as we currently use it a lot).

[lukasbestle]

Got rid of v-bind.

Naming the props just email and password would be super confusing IMO because the data is also called email and password. "Prefilled" makes clear that it's just the initial value.

[distantnative]

The data object is only internally and is user.email and user.password.

Alternatively, the prop would be value with an object as well to be more in line with our other components.

[lukasbestle]

Fine for me. Went with a value object so we can also prefill the code if needed.

[distantnative]

@lukasbestle looks good to me, added some inline docs for the props when we're already touching this. Also switched to inherit props to make them more consistent - we're trying to do it like that in more places recently.

[lukasbestle]

Looks good, thanks for the changes.