Warning for unused `$bindable()`

[ieedan]

Describe the problem

There's many times (mostly when using llms for autocomplete) where you have props that are marked as $bindable() but are never actually mutated within the component. This is often a bug because there is some implementation missing or the developer/agent is misunderstanding the need for a prop to be marked as $bindable().

Describe the proposed solution

A warning given in this scenario along the lines of:

Prop `name` is marked as `$bindable()` but is never mutated. svelte/no-unused-bindable

Importance

nice to have