Add code block integration coverage

[Alek99]

Summary

• add Playwright coverage for rx.code_block rendering options, line numbers, wrapping, and copy buttons
• ensure custom_style is passed through to react-syntax-highlighter as customStyle
• preserve pre-wrap behavior when wrap_long_lines is enabled

Fixes #6484

Tests

• uv run pytest tests/units/components/datadisplay/test_code.py
• uv run pytest tests/integration/tests_playwright/test_code_block.py
• uv run ruff check packages/reflex-components-code/src/reflex_components_code/code.py tests/integration/tests_playwright/test_code_block.py
• uv run ruff format --check packages/reflex-components-code/src/reflex_components_code/code.py tests/integration/tests_playwright/test_code_block.py
• uv run pyright packages/reflex-components-code/src/reflex_components_code/code.py
• git diff --check

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing issue-6484-code-block-tests (836335e) with main (9ed3692)}