fix(api): check http errors before using response in tests

internal/api/api_test.go

@@ -630,7 +630,10 @@ func TestUpdateEntity_Title(t *testing.T) {
 	req, _ := http.NewRequest("PUT", srv.URL+"/api/entities/"+created.ID, bytes.NewReader(
 		mustJSON(map[string]any{"title": "new title"})))
 	req.Header.Set("Content-Type", "application/json")
-	resp, _ := http.DefaultClient.Do(req)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
@@ -651,7 +654,10 @@ func TestUpdateEntity_Description(t *testing.T) {
 	req, _ := http.NewRequest("PUT", srv.URL+"/api/entities/"+created.ID, bytes.NewReader(
 		mustJSON(map[string]any{"description": "new desc"})))
 	req.Header.Set("Content-Type", "application/json")
-	resp, _ := http.DefaultClient.Do(req)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
@@ -674,7 +680,10 @@ func TestListEntities_TitleInResponse(t *testing.T) {
 		"title": title,
 	}).Body.Close()
 
-	resp, _ := http.Get(srv.URL + "/api/entities")
+	resp, err := http.Get(srv.URL + "/api/entities")
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
 	defer resp.Body.Close()
 
 	var entities []EntityResponse