add variant fileter

src/types/filters.ts

@@ -1,6 +1,10 @@
 import type { AlbionCity } from './api'
 import type { Tier, Enchantment } from './crafting'
 
+export type VariantType = 'basic' | 'artifact' | 'avalon' | 'crystal'
+
+export const ALL_VARIANTS: VariantType[] = ['basic', 'artifact', 'avalon', 'crystal']
+
 export interface FilterState {
   city: AlbionCity
   tiers: Set<Tier>
@@ -8,4 +12,5 @@ export interface FilterState {
   rrr: number
   nameFilter: string
   enchantments: Set<Enchantment> | null
+  variants: Set<VariantType> | null
 }