add explicit support for default values in input fields

[riccardobl]

We use the yup validation and value to set default values, but this seems fragile and prone to break as result of side effects from other code changes.

This pr adds an explicit defaultValue property to inputs.

[huumn]

I think in this case we want to use the initial object prop in Form.

For wallets, we'd do this here:

stacker.news/pages/settings/wallets/[wallet].js

Lines 32 to 47 in 7efd089

	const initial = useMemo(() => {
	const initial = wallet?.def.fields.reduce((acc, field) => {
	// We still need to run over all wallet fields via reduce
	// even though we use wallet.config as the initial value
	// since wallet.config is empty when wallet is not configured.
	// Also, wallet.config includes general fields like
	// 'enabled' and 'priority' which are not defined in wallet.fields.
	return {
	...acc,
	[field.name]: wallet?.config?.[field.name] || ''
	}
	}, wallet?.config)
	if (wallet?.def.fields.every(f => f.clientOnly)) {
	return initial
	}

Changing this line

stacker.news/pages/settings/wallets/[wallet].js

Line 41 in 7efd089

[field.name]: wallet?.config?.[field.name] || ''

to:

[field.name]: wallet?.config?.[field.name] || field.defaultValue || ''

[huumn]

I'm finishing this up right now

[huumn]

lol you beat me to it