Add guidance for handling render errors,

[jjones315]

Describe the problem

right now if any error occurs while rendering the page just silently dies in some cases. getting hit with this while dealing with issue 14046.

Describe the proposed solution

Adding something like an error boundary similar to react would be ideal, but if that's out of question documenting best practices in the documentation would be great.. I know this has been brought up before. not sure if svelte 5 will change anything.

Importance

would make my life easier