Desktop marketplace: show detail panel only on item click, left-align detail content (#13747)

* Desktop marketplace: show detail panel only on click, left-align detail content

Co-authored-by: Saoud Rizwan <saoudrizwan@users.noreply.github.com>

* Desktop marketplace: drop license cell, single Learn more link (homepage, else repo)

Co-authored-by: Saoud Rizwan <saoudrizwan@users.noreply.github.com>

* Desktop marketplace: keep selected entry open while list is filtered

Co-authored-by: Saoud Rizwan <saoudrizwan@users.noreply.github.com>

---------

Co-authored-by: Saoud Rizwan <saoudrizwan@users.noreply.github.com>