fix(lxlweb): sorting does not persist

[jesperengstrom]

Description

Solves

A combination of bugs have caused the search result sorting to be silently flawed.

• After changing sort, the facet links were not updated with the new value, causing sorting to reset when using them.
• Sorting component was then not reactive to this reset, still showing the user selection. Only by looking at the actual results, you realize something's wrong.

Have fixed:

• using :bind on the select element, the component is now reactive to url changes, displaying the actual sorting
• added tracking of _sort to the find layout load function where the facets are fetched (but sort param was forgotten)

Also discovered some more bugs:

• Lang-sensitive sort keys were not reactive to locale change. Fixed, now updating as expected
• Supersearch pill remove links did not update its data after sort change, also causing sorting to reset. Fixed, data is now manually fetched again after navigation when sorting has changed.

Also wrote a couple of tests to keep track of this feature

Summary of changes

Summary of changes

• Use bind:value={sortOrder} in SearchResultSort component
• Updated /find layout.server with _sort as reactive param
• Observe sort change in SupersearchWrapper, fetch data manually again
• Add tests