Tolerate Gemini image expansion drift

backend/services/gemini_test.go

@@ -145,6 +145,26 @@ func TestExpandImageQueriesFallsBackWhenGeminiFails(t *testing.T) {
 	}
 }
 
+func TestExpandImageQueriesAcceptsLoosePlainTextList(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"candidates":[{"content":{"parts":[{"text":"Here is the JSON requested\n1. cute cat\n2. cute cat gif\n3. cat reaction gif\n4. cat meme gif\n5. animated cat sticker"}]}}]}`))
+	}))
+	defer server.Close()
+
+	service := NewGeminiService("dummy-key", "gemini-2.5-flash")
+	service.Client = &http.Client{Timeout: 2 * time.Second}
+	service.GenerateEndpoint = server.URL
+
+	queries, err := service.ExpandImageQueries("고양이")
+	if err != nil {
+		t.Fatalf("expected loose plain-text list to be accepted, got %v", err)
+	}
+	if len(queries) != 5 || queries[0] != "cute cat" || queries[4] != "animated cat sticker" {
+		t.Fatalf("unexpected loose parsed queries: %#v", queries)
+	}
+}
+
 func TestSelectUnevaluatedCandidatesSkipsReviewedLinks(t *testing.T) {
 	ranked := []SearchResult{
 		{Link: "https://a.example"},