chore: replace queue_idle_task with queue_micro_task

[Rich-Harris]

We use queue_idle_task in exactly one place — removing defaults from inputs. To my mind it really doesn't warrant this special treatment — you have to have hundreds of <input> elements with a server-rendered value or checked attribute before it takes more than a single millisecond to remove all those attributes, at least on this four year old machine, and if they don't have a value attribute then you're actually making things worse with requestIdleCallback.

Just feels like a bad use of our complexity budget.

I think we can actually go further in simplifying this — like, what if we didn't bother removing these attributes at all until the form in question gets reset? — but for now I'm focused on just removing queue_idle_task to unblock further simplifications as to how we schedule things.

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[elliott-with-the-longest-name-on-github]

ty i love less complexity