Fix all static analysis errors (golangci-lint)

- Fix errcheck: handle all error return values in production code
- Fix errcheck: handle all error return values in test files
- Fix staticcheck: replace deprecated WithCredentialsFile with WithAuthCredentialsFile
- Remove unused code: authHeaders, planToEatPlannerItem, planToEatResponse
- Use defer func() { _ = x.Close() }() pattern for ignored close errors

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/internal/api/trello_test.go b/internal/api/trello_test.go
index 7433ff0..d677363 100644
--- a/internal/api/trello_test.go
+++ b/internal/api/trello_test.go
@@ -15,7 +15,7 @@ import (
 // newTestTrelloClient creates a TrelloClient for testing with custom base URL
 func newTestTrelloClient(baseURL, apiKey, token string) *TrelloClient {
 	client := NewTrelloClient(apiKey, token)
-	client.BaseClient.BaseURL = baseURL
+	client.BaseURL = baseURL
 	return client
 }
 
@@ -67,7 +67,7 @@ func TestTrelloClient_CreateCard(t *testing.T) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
+		_ = json.NewEncoder(w).Encode(response)
 	}))
 	defer server.Close()
 
@@ -122,7 +122,7 @@ func TestTrelloClient_CreateCard_WithDueDate(t *testing.T) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
+		_ = json.NewEncoder(w).Encode(response)
 	}))
 	defer server.Close()
 
@@ -176,7 +176,7 @@ func TestTrelloClient_UpdateCard(t *testing.T) {
 
 		// Return 200 OK
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte(`{"id":"card-123","name":"Updated Name"}`))
+		_, _ = w.Write([]byte(`{"id":"card-123","name":"Updated Name"}`))
 	}))
 	defer server.Close()
 
@@ -201,7 +201,7 @@ func TestTrelloClient_UpdateCard_Error(t *testing.T) {
 	// Mock server that returns error
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusBadRequest)
-		w.Write([]byte(`{"error":"Invalid card ID"}`))
+		_, _ = w.Write([]byte(`{"error":"Invalid card ID"}`))
 	}))
 	defer server.Close()