fix(tests): handle all Close() and Decode() errors across integration tests

Replace all unhandled resp.Body.Close() calls throughout the test suite:

- Deferred calls: replace 'defer VAR.Body.Close()' with a closure that explicitly
  discards the error via 'defer func(Body io.ReadCloser) { _ = Body.Close() }(VAR.Body)'
- Immediate calls: replace 'VAR.Body.Close()' with '_ = VAR.Body.Close()'

Replace all unhandled json.NewDecoder(VAR.Body).Decode(&x) calls with error capture
and require.NoError assertion. Files using httptest.ResponseRecorder (collections_preview,
processing_issues) use 'err :=' declaration; suite-style tests (scanner_integration,
dashboard_integration) use s.T() instead of t.

cmd/server/tests/search_test.go

@@ -431,7 +431,9 @@ func TestCollectionSearchLibraryFilter(t *testing.T) {
 
 			resp, err := client.Do(req)
 			require.NoError(t, err)
-			defer resp.Body.Close()
+			defer func(Body io.ReadCloser) {
+				_ = Body.Close()
+			}(resp.Body)
 
 			// Log response for debugging
 			if resp.StatusCode != http.StatusOK {
@@ -440,7 +442,8 @@ func TestCollectionSearchLibraryFilter(t *testing.T) {
 			}
 
 			var result []map[string]interface{}
-			json.NewDecoder(resp.Body).Decode(&result)
+			err = json.NewDecoder(resp.Body).Decode(&result)
+			require.NoError(t, err)
 
 			if tt.expectedCount > 0 {
 				require.Equal(t, http.StatusOK, resp.StatusCode)
@@ -483,11 +486,14 @@ func createLibrary(t *testing.T, client *http.Client, setup *TestServerSetup, na
 
 	resp, err := client.Do(req)
 	require.NoError(t, err)
-	defer resp.Body.Close()
+	defer func(Body io.ReadCloser) {
+		_ = Body.Close()
+	}(resp.Body)
 	require.Equal(t, http.StatusCreated, resp.StatusCode)
 
 	var result map[string]interface{}
-	json.NewDecoder(resp.Body).Decode(&result)
+	err = json.NewDecoder(resp.Body).Decode(&result)
+	require.NoError(t, err)
 	return result
 }
 
@@ -509,10 +515,13 @@ func createTestMediaItemIDInLibrary(t *testing.T, client *http.Client, setup *Te
 
 	resp, err := client.Do(req)
 	require.NoError(t, err)
-	defer resp.Body.Close()
+	defer func(Body io.ReadCloser) {
+		_ = Body.Close()
+	}(resp.Body)
 	require.Equal(t, http.StatusCreated, resp.StatusCode)
 
 	var result map[string]interface{}
-	json.NewDecoder(resp.Body).Decode(&result)
+	err = json.NewDecoder(resp.Body).Decode(&result)
+	require.NoError(t, err)
 	return result["id"].(string)
 }