feat: tell the plan picker when a seat's plan is on the way out

The billing view now names each seat's status; the console passes it
through to the picker so a cancel-pending plan can be kept, plus the
two strings that flow renders.

src/gui/src/UI/Dashboard/TabTeams.js

@@ -353,6 +353,7 @@ const loadPlan = async (teamUid) => {
             status: 'ready',
             offerings: Array.isArray(cat.offerings) ? cat.offerings : [],
             seatTiers: entry?.seatTiers ?? {},
+            seatStatuses: entry?.seatStatuses ?? {},
             tierQuantities: entry?.tierQuantities ?? {},
             subStatus: entry?.status ?? null,
         };
@@ -370,6 +371,7 @@ const changeSeatPlan = ($el_window, username, uuid) => {
             seatUuid: uuid,
             username,
             currentTier: state.plan.seatTiers?.[uuid] ?? null,
+            currentStatus: state.plan.seatStatuses?.[uuid] ?? null,
             onDone: () => refresh($el_window),
         },
     }));

src/gui/src/i18n/translations/en.js

@@ -567,6 +567,8 @@ const en = {
         teams_upgrade_to: 'Upgrade to %%',
         teams_switch_to: 'Switch to %%',
         teams_switch_to_free: 'Switch to Free',
+        teams_keep_plan: 'Keep %%',
+        teams_plan_ending: 'Ends with the current period',
         teams_cancel_keeps_until: 'Done. The plan stays active until the end of the period it was paid for, then the account moves to Free.',
         teams_audit_range: '{{from}}–{{to}} of {{total}}',
         previous: 'Previous',