AddwhenNested() ornested flag towhen() for grouped conditions

Closures passed intowhen() are currentlynot grouped automatically.
Because of this, mixedwhere /orWhere conditions are applied directly to the main query unless an extra nested closure is added.

Problem Example

->when($condition,fn ($q) =>$q->where('author_id',1)->orWhere('published',true));

This produces SQL like:

...AND author_id=1OR published= true

To ensure proper grouping today, you must write:

->when($condition,fn ($q) =>$q->where(fn ($q2) =>$q2->where('author_id',1)->orWhere('published',true)    ));

This becomes verbose and reduces readability.

Proposal

Introduce one of the following (or both, if desired):

1. New whenNested() method

->whenNested($condition,fn ($q) =>...)

This would automatically apply the callback inside a grouped where, so it would produce clean, grouped SQL:

...AND (author_id=1OR published= true)

2. Add a nested parameter to when()

->when($condition,fn ($q) =>..., nested:false)

nested defaults to false, preserving all existing behavior.

When set to true, the callback is executed inside a grouped where, and would also produce:

...AND (author_id=1OR published= true)

Summary

AddingwhenNested() or a nested parameter towhen() would simplify grouped conditional queries, prevent subtle logic errors, and improve readability while remaining fully backward compatible.

If this sounds useful, I’m happy to create a PR to implement it.