fix(content): 랭킹 상세 이동 guard를 보강한다

app/src/test/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragmentSourceTest.kt

@@ -85,6 +85,17 @@ class ContentMainFragmentSourceTest {
         assertTrue(source.contains("toContentBannerIntent(requireContext())"))
     }
 
+    @Test
+    fun `content 랭킹 routing은 유효하지 않은 contentId를 무시한다`() {
+        val source = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragment.kt"
+        ).readText()
+
+        assertTrue(source.contains("private fun openRankingAudioContentDetail(item: ContentRankingItem)"))
+        assertTrue(source.contains("item.contentId.toLongOrNull()?.takeIf { it > 0L } ?: return"))
+        assertTrue(source.contains("openAudioContentDetail(audioContentId)"))
+    }
+
     @Test
     fun `content 추천 layout은 Phase 4~6 item layout과 제외 섹션 정책을 지킨다`() {
         val fragmentLayout = projectFile("app/src/main/res/layout/fragment_v2_main_content.xml").readText()