Deliver native #[On] events and #[Poll] timers to nested components

[ngunyimacharia]

Problem

Native events and #[Poll] timers only reach the root screen. A nested component's #[On] listeners never fire, and its polls never run.

Component events already walk the whole tree (deliverComponentEvent()), and so does Livewire: every listening component on the page gets a dispatched event, and a child's wire:poll polls on its own. Native events and polls were the odd ones out.

Fix

The host now walks its component tree (componentTree()) when it:

• delivers a native event to #[On] listeners
• works out the next poll deadline
• runs due polls

Global dispatch still fires once per event.

Behavior change: a nested component that already declares #[Poll] will now actually poll, and each tick re-renders the host.

Supersedes #413.

Performance

The cost is about 0.5 µs per child per runloop wake-up, and about 0.8 µs per child per native event. Attributes are reflected once per instance and cached. I measured it over 20k calls:

per call	before	1 child	20 children	200 children
nextEventTimeout()	~1.3 µs	2.2 µs	11.9 µs	104 µs
runDuePolls()	~2 µs	2.9 µs	11.0 µs	88 µs
dispatchNativeEvent()	~17 µs	19.1 µs	34.0 µs	175 µs

Tests

tests/Feature/Edge/NestedPollAndOnTest.php covers child polls, child poll deadlines and child #[On] delivery.

[ngunyimacharia]

Trying a different approach.