fix: 토너먼트 단계를 순차 노출하고 참가 조를 표시한다

예선, 본선, 16강 영역을 실제 진행 단계부터 누적해서 보여준다. 참가 신청이 성공하면 배정된 예선 조를 선택하고 해당 표로 이동한다.

app/game-frontend/test/tournamentStatus.test.ts

@@ -1,6 +1,6 @@
 import assert from 'node:assert/strict';
 import { describe, it } from 'node:test';
-import { resolveTournamentStageName } from '../src/utils/tournamentStatus.ts';
+import { resolveTournamentSectionVisibility, resolveTournamentStageName } from '../src/utils/tournamentStatus.ts';
 
 void describe('tournament status labels', () => {
     void it('describes inactive and active tournament stages', () => {
@@ -14,4 +14,32 @@ void describe('tournament status labels', () => {
         assert.equal(resolveTournamentStageName(11), '상태 확인 중');
         assert.equal(resolveTournamentStageName(-1), '상태 확인 중');
     });
+
+    void it('reveals tournament sections only after their stage begins and retains completed results', () => {
+        assert.deepEqual(resolveTournamentSectionVisibility(0), {
+            preliminary: false,
+            final: false,
+            knockout: false,
+        });
+        assert.deepEqual(resolveTournamentSectionVisibility(1), {
+            preliminary: true,
+            final: false,
+            knockout: false,
+        });
+        assert.deepEqual(resolveTournamentSectionVisibility(3), {
+            preliminary: true,
+            final: true,
+            knockout: false,
+        });
+        assert.deepEqual(resolveTournamentSectionVisibility(5), {
+            preliminary: true,
+            final: true,
+            knockout: true,
+        });
+        assert.deepEqual(resolveTournamentSectionVisibility(0, 7), {
+            preliminary: true,
+            final: true,
+            knockout: true,
+        });
+    });
 });