Explorer series screens keep a single series name, reset rarity filters when leaving the series, and hide Masterset while that action is not usable. The duplicate title under the series logo is removed.

Merged into app staging in #884 as 1a8d1937599a3116d03ef83d1d7df77782120104. Not deployed. Local gates only. Series logos for several promo and anniversary sets are still missing; see the beta feedback rollup.