Cleanup: Replace literals by enums (#3252)

## Description:

Some literals were present that could/should have been enums. Replaced
them.

For Util.ts > createRandomName, also changed type of parameter
playerType from string to PlayerType. All callers already send it this
type.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tryout33

src/core/ApiSchemas.ts

@@ -1,7 +1,13 @@
 import { z } from "zod";
 import { base64urlToUuid } from "./Base64";
 import { BigIntStringSchema, PlayerStatsSchema } from "./StatsSchemas";
-import { Difficulty, GameMapType, GameMode, GameType } from "./game/Game";
+import {
+  Difficulty,
+  GameMapType,
+  GameMode,
+  GameType,
+  RankedType,
+} from "./game/Game";
 
 export const RefreshResponseSchema = z.object({
   token: z.string(),
@@ -176,7 +182,7 @@ export type RankedLeaderboardEntry = z.infer<
 >;
 
 export const RankedLeaderboardResponseSchema = z.object({
-  "1v1": RankedLeaderboardEntrySchema.array(),
+  [RankedType.OneVOne]: RankedLeaderboardEntrySchema.array(),
 });
 export type RankedLeaderboardResponse = z.infer<
   typeof RankedLeaderboardResponseSchema

src/core/Util.ts

@@ -1,6 +1,6 @@
 import DOMPurify from "dompurify";
 import { customAlphabet } from "nanoid";
-import { Cell, Unit } from "./game/Game";
+import { Cell, PlayerType, Unit } from "./game/Game";
 import { GameMap, TileRef } from "./game/GameMap";
 import {
   GameConfig,
@@ -291,10 +291,10 @@ export function withinInt(num: bigint, min: bigint, max: bigint): bigint {
 
 export function createRandomName(
   name: string,
-  playerType: string,
+  playerType: PlayerType,
 ): string | null {
   let randomName: string | null = null;
-  if (playerType === "HUMAN") {
+  if (playerType === PlayerType.Human) {
     const hash = simpleHash(name);
     const prefixIndex = hash % BOT_NAME_PREFIXES.length;
     const suffixIndex =