🧹 refactor: avoid cloning DslBlockValue in web module render_children

[Tcode-Motion]

🎯 What: Extracted the DSL-to-HTML block rendering logic into a new helper function dsl_block_to_html that takes a reference to DslBlockValue, and refactored render_children to use it instead of unnecessarily cloning the block and wrapping it in RuntimeValue::DslBlock.

💡 Why: This improves both readability and maintainability by keeping the rendering functions cleaner, while also addressing a minor performance inefficiency where entire block tree structures were needlessly cloned during rendering just to satisfy the wrapper's type requirement.

✅ Verification: Verified by running cargo test --workspace to ensure that all standard library tests, particularly test_dsl_semantic_full_web_page and HTML generation logic, pass successfully.

✨ Result: A more concise and efficient render_children function that correctly passes references downstream without artificial allocations.

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PR created automatically by Jules for task 16402512525937100324 started by @Tcode-Motion

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