Copy a garden (deep duplicate) from the gardens list (#46)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

internal/store/sqlite.go

@@ -5,6 +5,7 @@
 package store
 
 import (
+	"context"
 	"database/sql"
 	"fmt"
 	"net/url"
@@ -99,6 +100,13 @@ func pragmaName(p string) string {
 	return strings.ToLower(strings.TrimSpace(p))
 }
 
+// queryer is the read surface shared by *sql.DB and *sql.Tx, so a list helper can
+// serve both a standalone read and one inside a transaction. (Its single-row
+// counterpart is `scanner`, in users.go.)
+type queryer interface {
+	QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
+}
+
 // qualifyColumns prefixes each comma-separated column in cols with "alias." so a
 // shared column list can be used in a JOIN — e.g. qualifyColumns("pl", "id, x")
 // → "pl.id, pl.x". Whitespace/newlines in the list are trimmed.