Add function to fetch player information (#2010)

## Description:

This pull request introduces the fetchPlayerById() function together
with its associated schema components.

It represents one part of a series of split pull requests related to the
PlayerInfoModal (Player Profile). Subsequent pull requests will address
UI implementation and additional features.

(origin pr:https://github.com/openfrontio/OpenFrontIO/pull/1758)

## 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:

aotumuri

---------

Co-authored-by: evanpelle <evanpelle@gmail.com>

src/client/jwt.ts

@@ -1,6 +1,8 @@
 import { decodeJwt } from "jose";
 import { z } from "zod";
 import {
+  PlayerProfile,
+  PlayerProfileSchema,
   RefreshResponseSchema,
   TokenPayload,
   TokenPayloadSchema,
@@ -268,3 +270,42 @@ export async function getUserMe(): Promise<UserMeResponse | false> {
     return false;
   }
 }
+
+export async function fetchPlayerById(
+  playerId: string,
+): Promise<PlayerProfile | false> {
+  try {
+    const base = getApiBase();
+    const token = getToken();
+    if (!token) return false;
+    const url = `${base}/player/${encodeURIComponent(playerId)}`;
+
+    const res = await fetch(url, {
+      headers: {
+        Accept: "application/json",
+        Authorization: `Bearer ${token}`,
+      },
+    });
+
+    if (res.status !== 200) {
+      console.warn(
+        "fetchPlayerById: unexpected status",
+        res.status,
+        res.statusText,
+      );
+      return false;
+    }
+
+    const json = await res.json();
+    const parsed = PlayerProfileSchema.safeParse(json);
+    if (!parsed.success) {
+      console.warn("fetchPlayerById: Zod validation failed", parsed.error);
+      return false;
+    }
+
+    return parsed.data;
+  } catch (err) {
+    console.warn("fetchPlayerById: request failed", err);
+    return false;
+  }
+}