Fix custom error pages extending wrong Blade view namespace

[mlintangmz2765]

Motivation

• Error templates in resources/views/errors/* attempted to extend a namespaced view (errors::layout) which can fail if the namespace is not registered, causing error pages to throw a secondary view-resolution exception.

Description

• Replace @extends('errors::layout') with @extends('errors.layout') across the seven custom error templates (401, 403, 404, 419, 429, 500, 503) so Laravel resolves the local resources/views/errors/layout.blade.php correctly.

Testing

• Ran php -l on PHP files (no syntax errors) and searched for remaining errors::layout usages (none found); composer test failed due to missing vendor/autoload.php and composer install could not complete because of network/proxy errors when fetching packages.

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Codex Task