⚡ Bolt: [String allocation optimization in std.web]

[Tcode-Motion]

💡 What: Modified dsl_to_html and render_children in stdlib/src/web.rs to pass a mutable string buffer (&mut String) down the recursive call stack rather than returning and concatenating new String instances at each step.
🎯 Why: To significantly reduce intermediate heap allocations when rendering nested DSL blocks, addressing a known performance bottleneck when generating deep HTML structures.
📊 Impact: Substantial reduction in intermediate string allocations and improved DSL rendering speed, as string appending using &mut String is significantly faster than allocating and concatenating new strings recursively.
🔬 Measurement: The change avoids creating temporary String values for every DSL node, which can be verified by profiling or benchmarking std.web.render_dsl.

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PR created automatically by Jules for task 7227583827114981435 started by @Tcode-Motion

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