Improve default logo handling somehow

[rhoerr]

Right now this module forceably overrides the default logo/icon to Magento's generic magento-logo/magento-icon if none is defined.

module-custom-admin-logo/view/adminhtml/templates/page/header.phtml

Lines 30 to 38 in f80a23a

	<?php if ($adminLogoViewModel->isAdminLoginPage()): ?>
	src="<?= $escaper->escapeUrl(
	$adminLoginLogoSrc ?: $block->getViewFileUrl('images/magento-logo.svg')
	); ?>"
	<?php else: ?>
	src="<?= $escaper->escapeUrl(
	$adminMenuLogoSrc ?: $block->getViewFileUrl('images/magento-icon.svg')
	); ?>"
	<?php endif; ?>

This works but is kind of limiting. If installed on Adobe Commerce or Mage-OS, it'll mean Magento's logo pops in rather than the distribution's alternative.

It would be nice to resolve that in some way, either

• Falling back to default behavior in some way if a custom logo/icon isn't defined, to preserve whatever is there out of box, or
• Creating some way to gracefully change the defaults, that others (Adobe Commerce, Mage-OS, Hyva Commerce, etc.) can hook onto.

I would like to integrate this module into Mage-OS by default in May (3.0), but this is a blocker we need to overcome in some way before that's an option.