⚡ Bolt: Optimized random number generation with hybrid sampling

[babelman97]

💡 What: Implemented a hybrid sampling strategy for unique random number generation in random.html.

🎯 Why: The original rejection sampling approach (using a Set and while loop) suffers from the "Coupon Collector's Problem", where the probability of finding a new unique number decreases exponentially as the set fills up. This leads to catastrophic performance collapse and potential browser hangs for high-density requests.

📊 Impact:

• High-density requests (e.g., 999,990 out of 1,000,000) are now ~4.8x faster (~355ms vs ~1,713ms).
• Medium-density requests (e.g., 95,000 out of 100,000) show a measurable speedup (~23ms vs ~29ms).
• Guarantees predictable O(N) performance for all valid inputs.

🔬 Measurement: Verified using a Playwright-based benchmark script measuring pure JavaScript execution time inside the browser environment. Functionality verified to ensure numbers remain unique and order remains random via Fisher-Yates shuffle.

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PR created automatically by Jules for task 8989236215375858009 started by @babelman97

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