[✨] deprecate signals on regular DOM attributes

[wmertens]

Is your feature request related to a problem?

When writing a component that forwards class, the correct way to forward it is (props.class as Signal<string>)?.value ?? props.class as string.

This is a mouthful and there's no reason to support this, because the optimizer will forward class={signal.value} correctly.

Describe the solution you'd like

Deprecate signals as DOM attribute values except where expected, like bind: value

Describe alternatives you've considered

.

Additional context

No response