style: prefer stdlib idioms for errors and http methods

internal/store/download_info.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"time"
 
@@ -24,12 +25,12 @@ func (s *Store) DownloadInfo(trackID string) (*DownloadInfo, error) {
 	if err := s.db.View(func(tx *bbolt.Tx) error {
 		b := tx.Bucket(trackBucket)
 		if b == nil {
-			return fmt.Errorf("bucket not found")
+			return errors.New("bucket not found")
 		}
 
 		data := b.Get([]byte(trackID))
 		if data == nil {
-			return fmt.Errorf("not found")
+			return errors.New("not found")
 		}
 		return json.Unmarshal(data, &info)
 	}); err != nil {

internal/store/store.go

@@ -6,19 +6,19 @@ import (
 	"path/filepath"
 	"time"
 
-	bolt "go.etcd.io/bbolt"
+	"go.etcd.io/bbolt"
 	bolterrors "go.etcd.io/bbolt/errors"
 )
 
 type Store struct {
-	db *bolt.DB
+	db *bbolt.DB
 }
 
 func Open(dir string) (*Store, error) {
-	db, err := bolt.Open(filepath.Join(dir, ".tracks.db"), 0600, &bolt.Options{Timeout: 5 * time.Second})
+	db, err := bbolt.Open(filepath.Join(dir, ".tracks.db"), 0600, &bbolt.Options{Timeout: 5 * time.Second})
 	if err != nil {
 		if errors.Is(err, bolterrors.ErrTimeout) {
-			return nil, fmt.Errorf("database is already in use by another process")
+			return nil, errors.New("database is already in use by another process")
 		}
 		return nil, fmt.Errorf("failed to open database: %w", err)
 	}