style: apply K&R + tab formatting across the codebase (make cs-fix)

Mechanical, behaviour-preserving reformat produced by 'make cs-fix' under
the new build/phpcs.xml.dist ruleset: K&R braces, tab indentation, and the
other whitespace normalisations. No logic changes.

tests/Unit/PhpM3u8/Data/Transformer/AttributeStringToArrayTest.php

@@ -1,16 +1,13 @@
 <?php
 
-declare(strict_types=1);
 
 namespace Chrisyue\PhpM3u8\Test\Data\Transformer;
 
 use Chrisyue\PhpM3u8\Data\Transformer\AttributeStringToArray;
 use PHPUnit\Framework\TestCase;
 
-class AttributeStringToArrayTest extends TestCase
-{
-    public function testInvoke(): void
-    {
+class AttributeStringToArrayTest extends TestCase {
+    public function testInvoke(): void {
         $attr2Array = new AttributeStringToArray();
 
         $string = 'FOO=BAR,URI="http://example.com/?p=1"';