Fix AtRuleParser to correctly parse at-rule names without trailing braces

[Copilot]

Problem

The AtRuleParser.getAtRuleName() method incorrectly included trailing { characters in at-rule names when there was no space before the opening brace. This caused validation errors for valid CSS at-rules.

Before:

@font-face{           → parsed as "font-face{"  ❌
@media screen{        → parsed as "media"       ❌ (but affected value parsing)

After:

@font-face{           → parsed as "font-face"   ✅
@media screen{        → parsed as "media"       ✅ (with correct value "screen")

Solution

Updated the getAtRuleName() method to remove trailing { characters using the existing removeEndingString() utility method. This ensures consistent parsing regardless of spacing before the opening brace.

Changes:

• Modified src/CssLint/Tokenizer/Parser/AtRuleParser.php to strip trailing { from at-rule names
• Added comprehensive test cases covering edge cases without spaces before braces
• Verified existing functionality remains intact

Testing

• ✅ All existing tests continue to pass (117/117)
• ✅ Added 3 new test cases for at-rules without spaces before braces
• ✅ Validated with complete CSS strings containing @font-face rules
• ✅ Confirmed @font-face properties (font-display, src, unicode-range) are correctly defined in referential

Impact

This fix resolves validation errors for properly formatted CSS at-rules, particularly @font-face declarations, improving the linter's accuracy and reducing false positives.

Warning

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• https://api.github.com/repos/Masterminds/html5-php/zipball/f5ac2c0b0a2eefca70b2ce32a5809992227e75a6
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• https://api.github.com/repos/guzzle/guzzle/zipball/7b2f29fe81dc4da0ca0ea7d42107a0845946ea77
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• https://api.github.com/repos/guzzle/psr7/zipball/c2270caaabe631b3b44c85f99e5a04bbb8060d16
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• https://api.github.com/repos/krakjoe/pcov-clobber/zipball/4c30759e912e6e5d5bf833fb3d77b5bd51709f05
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• https://api.github.com/repos/nikic/PHP-Parser/zipball/715f4d25e225bc47b293a8b997fe6ce99bf987d2
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• https://api.github.com/repos/php-fig/http-client/zipball/bb5906edc1c324c9a05aa0873d40117941e5fa90
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• https://api.github.com/repos/php-fig/http-factory/zipball/2b4765fddfe3b508ac62f829e852b1501d3f6e8a
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• https://api.github.com/repos/php-fig/http-message/zipball/402d35bcb92c70c026d1a6a9883f06b2ead23d71
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• https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822
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• https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/5c9eeac41b290a3712d88851518825ad78f45c71
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• https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/b4f479ebdbf63ac605d183ece17d8d7fe49c15c7
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• https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/e75bd0f07204fec2a0af9b0f3cfe97d05f92efc1
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• https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/05d5692a7993ecccd56a03e40cd7e5b09b1d404e
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• https://api.github.com/repos/sebastianbergmann/type/zipball/75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7
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• https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c
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• https://api.github.com/repos/symfony/console/zipball/7d29659bc3c9d8e9a34e2c3414ef9e9e003e6cf3
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• https://api.github.com/repos/symfony/css-selector/zipball/cb23e97813c5837a041b73a6d63a9ddff0778f5e
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