feat: implement real-time leaderboard system with XP and voice channel tracking features

lib/leaderboard/ranking.test.ts

@@ -81,6 +81,19 @@ describe("XP leaderboard", () => {
 
     expect(result.rows.map((row) => row.userId)).toEqual(["1", "2", "3"]);
   });
+
+  test("searches identities while preserving overall ranks", () => {
+    const result = buildXpLeaderboard([
+      xpRow("top", "1000", 4, "Alpha"),
+      xpRow("target", "900", 3, "Beta"),
+      xpRow("third", "800", 2, "Gamma"),
+    ], 1, "target-user");
+
+    expect(result.totalRows).toBe(1);
+    expect(result.rows.map(({ userId, rank }) => [userId, rank])).toEqual([
+      ["target", 2],
+    ]);
+  });
 });
 
 describe("voice leaderboard", () => {
@@ -131,6 +144,20 @@ describe("voice leaderboard", () => {
     expect(unresolved?.username).toBeNull();
     expect(shortenDiscordId("123456789012345678")).toBe("12345…5678");
   });
+
+  test("searches aggregated voice rows", () => {
+    const result = buildVoiceLeaderboard(
+      rows,
+      ["voice-1", "voice-2"],
+      1,
+      undefined,
+      "missing",
+    );
+
+    expect(result.rows.map(({ userId, rank }) => [userId, rank])).toEqual([
+      ["missing", 3],
+    ]);
+  });
 });
 
 describe("leaderboard formatting", () => {