new help section explaining classes and their mechanics

src/platform/BottomDisplayApp.tsx

@@ -20,6 +20,7 @@ function screenTitle(screen: AppScreen) {
     case "login": return "Sign in or continue offline";
     case "saves": return "Choose hunter save";
     case "home": return "Choose expedition";
+    case "class-help": return "Class field guide";
     case "profile": return "Hunter profile";
     case "gear": return "Gear upgrade";
     case "appearance": return "Appearance Lab";
@@ -134,6 +135,9 @@ export function BottomDisplayApp() {
       selectInfusion: (infusionId) => postFrontend({ name: "selectInfusion", infusionId }),
       selectPassiveAbility: (abilityId) => postFrontend({ name: "selectPassiveAbility", abilityId }),
       selectPassiveInfusion: (passiveId) => postFrontend({ name: "selectPassiveInfusion", passiveId }),
+      openClassHelp: () => postFrontend({ name: "openClassHelp" }),
+      selectGuideClass: (classId) => postFrontend({ name: "selectGuideClass", classId }),
+      selectGuideAbility: (abilityId) => postFrontend({ name: "selectGuideAbility", abilityId }),
       selectProfileCollectionView: (view) => postFrontend({ name: "selectProfileCollectionView", view }),
       selectProfileGroup: (groupId) => postFrontend({ name: "selectProfileGroup", groupId }),
       selectProfileStat: (statId) => postFrontend({ name: "selectProfileStat", statId }),