Thorough review of the tests, increasing test coverage and cleanup.

Changed

• Changed Phalcon\Assets\Manager filter type check from is_object() to typeof and updated the error message to "The filter is not valid" #16889
• Changed Phalcon\Di\Exception message for missing services from "was not found in the dependency injection container" to "is not registered in the container" #16889
• Changed Phalcon\Di\Service\Builder error messages for service parameters to use double quotes instead of single quotes #16889
• Changed exception messages across multiple components to use "does not" instead of "doesn't" for consistency #16889

Fixed

• Fixed Phalcon\Filter\Validation\AbstractValidator::messageFactory() to pass the joined field string to Phalcon\Messages\Message instead of the raw array when multiple fields are provided #16889
• Fixed Phalcon\Filter\Validation::bind() to skip the dependency injection container lookup when data is empty, preventing unnecessary Di\Exception errors #16889
• Fixed Phalcon\Html\Escaper::css() and Phalcon\Html\Escaper::js() to return an empty string instead of false when the input is empty or contains only a null codepoint #16889
• Fixed Phalcon\Http\Response::setStatusCode() exception message from "Non-standard statuscode given without a message" to "Non-standard status-code given without a message" #16889
• Fixed Phalcon\Image\Adapter\Imagick::processPixelate() to explicitly cast division result to int to prevent implicit float-to-int deprecation #16889
• Fixed Phalcon\Support\Helper\Json\Encode to prefix the InvalidArgumentException message with "json_encode error: " for consistency #16889
• Fixed Phalcon\Storage\Adapter\Libmemcached, Phalcon\Storage\Adapter\Redis and Phalcon\Storage\Adapter\Weak to call initSerializer() during construction #16889
• Fixed Phalcon\Storage\Adapter\Redis to initialize lifetime from options during construction #16889