Fix conditional slots being always rendered

[ganyicz]

Draft — this doesn't handle folded components yet. Slots inside conditionals will still always render when the component is folded. To fix this, we need to statically analyze the component and abort the fold when a slot is conditionally rendered.

The scenario

Wrapping <x-slot> in @if always renders the slot, even when the condition is false.

<x-card>
    @if(false)
    <x-slot name="header">
        Header
    </x-slot>
    @endif
</x-card>

The problem

Blaze extracted slot declarations at compile time, stripping them from their surrounding Blade directives. Runtime conditionals like @if were never evaluated around the slot.

The solution

We now compile slots inline alongside the rest of the template instead of extracting them upfront.

Fixes #119