add canonical pagination links

[JimmyHoenderdaal]

Description
Adds canonical, prev, and next links for paginated category pages. This helps search engines understand paginated listing URLs and avoids duplicate content issues.

Breadcrumb structured data was already present through BreadcrumbList.

Tests

Checked rendered head tags on rapidez.test/women/tops-women.html
Checked rendered head tags on ?page=1 and ?page=2
Ran PHP syntax checks

Reference
RAP-1898

[Jade-GG]

Shouldn't the minimum value for page be 1 and not 0?

Suggested change

	$currentPage = max((int) request('page', 0), 0);
	$currentPage = max((int) request('page', 1), 1);

[Jade-GG]

Given that we always define what $perPage is when using this component, and ceil will always return a float, we don't need to do so many casts and extra checks.

Doing the -1 also doesn't make sense if pages are 1-indexed. We now have an off-by-one error. (you can check this yourself by assuming $perPage is 2: if you have 5 products, you should have 3 pages, and ceil(5/2) = 3 already.)

Suggested change

	$lastPage = max((int) ceil($total / max((int) $perPage, 1)) - 1, 0);
	$lastPage = max(ceil($total / $perPage), 1);

[Jade-GG]

This seems unnecessary. Aside from the fact that, again, pages are 1-indexed so this will never return false in the first place, you can just have ?page=1 without any issues. I'd remove this line and keep it simple with the lower two lines using something like

href={{ $url . '?page=' . $currentPage - 1 }}