fix: schedule status system — auto-key, config order, label lookup

- Auto-generate status key from label (admin doesn't need to set keys)
- Remove visible key field from status config editor
- Order statuses/levels in filters by config order (matches admin panel)
- Shared findStatusConfig() for robust label lookup (by key, label, or derived key)
- Custom status badges in DayCard, GroupCard, MobileSchedule
- Simplified filter logic with clsStatus helper
- Removed dead code: TIME_PRESETS, StatusFilter type
- SelectField: blur input after selection to prevent re-open

src/app/admin/_components/FormField.tsx

@@ -251,6 +251,7 @@ export function SelectField({
                   onChange(opt.value);
                   setOpen(false);
                   setSearch("");
+                  inputRef.current?.blur();
                 }}
                 className={`w-full px-4 py-2 text-left text-sm transition-colors hover:bg-white/5 ${
                   opt.value === value ? "text-gold bg-gold/5" : "text-white"