⚡ Bolt: [optimize canvas aura loop formatting]

[Tcode-Motion]

💡 What: Replaced svg.push_str(&format!(...)) with let _ = write!(svg, ...); inside the loop that renders the canvas "aura" element in stdlib/src/canvas.rs.
🎯 Why: To avoid allocating a temporary String on each iteration of the loop, reducing memory allocations and improving string rendering performance on this code path.
📊 Impact: Expecting faster processing when executing a high number of iterations.
🔬 Measurement: Microbenchmarking 100,000 iterations comparing push_str(&format!(...)) with write!(...) revealed a ~17% average performance improvement.

• Baseline (Format): ~0.0325 seconds average.
• Optimized (Write): ~0.0268 seconds average.

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PR created automatically by Jules for task 15734656689160714969 started by @Tcode-Motion

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