Add comprehensive text-align test cases to fixtures/html

[Copilot]

Enhanced the existing text-rendering-test.html file to include all text-align values supported by JSAR Runtime's CSS implementation.

Background

The existing text alignment tests only covered the basic CSS text-align values (left, center, right, justify), but JSAR Runtime's CSS parser in src/client/cssom/values/specified/text.hpp supports additional values that were missing from the test suite.

Changes

Added three missing text-align test cases:

• text-align: start - Aligns text to the start edge (writing direction dependent)
• text-align: end - Aligns text to the end edge (writing direction dependent)
• text-align: match-parent - Inherits parent's text alignment behavior

Each test case includes:

• Appropriate CSS class definitions following existing patterns
• Bilingual test content (Chinese and English) for comprehensive validation
• Consistent styling and layout with existing tests

Implementation Details

The changes maintain the existing file structure and follow established patterns:

.align-start { text-align: start; }
.align-end { text-align: end; }
.align-match-parent { text-align: match-parent; }

<div class="test-item">
  <div class="test-label">text-align: start</div>
  <p class="align-start">这是起始对齐的文本。This is start-aligned text...</p>
</div>

Visual Result

The screenshot shows all seven text-align values now working correctly in the test suite, providing comprehensive coverage for text alignment functionality in JSAR Runtime.

Testing

Verified that all test cases render correctly and demonstrate the expected text alignment behaviors. The enhanced test file maintains backward compatibility while expanding test coverage for the complete set of supported text-align values.

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