GEN2_STATUS_IDS (psn/brn/frz/par/paralysis/slp -> Gen 2's own registry ids)
was declared verbatim in both PartyMenu.lua and SummaryMenu.lua; move it to
Status.GEN2_ID_ALIASES so a future status alias fix only has one copy to
update.
SummaryMenu.TYPE_NAMES was left behind after this branch switched its two
former internal uses to the shared TypeChart.displayName/DISPLAY_NAMES; it
has no remaining callers anywhere in src/ or tests/.
thibautbus