⚡ Bolt: Optimize backspace arguments generation in typer

[shuv1337]

💡 What: Refactored the _backspace_args method in shuvoice/typer.py to use list multiplication ["wtype"] + ["-k", "BackSpace"] * count instead of a Python for loop with repeated .extend() calls.

🎯 Why: Generating repeated command-line arguments using iterative method calls in the Python evaluation loop is slower and less memory-efficient. By using the multiplication operator *, the list operations are executed at the C level.

📊 Impact: This provides up to ~90% performance improvement for generating repeated command-line arguments (e.g., from ~0.70s to ~0.08s for 100,000 iterations of count=50).

🔬 Measurement: Verified with the following benchmark:

import timeit

def f1(count):
    args = ["wtype"]
    for _ in range(count):
        args.extend(["-k", "BackSpace"])
    return args

def f2(count):
    return ["wtype"] + ["-k", "BackSpace"] * count

print("f1(50):", timeit.timeit("f1(50)", globals=globals(), number=100000))
print("f2(50):", timeit.timeit("f2(50)", globals=globals(), number=100000))

Output:

f1(50): 0.7018764400000066
f2(50): 0.08434506800000463

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PR created automatically by Jules for task 6910958989138648399 started by @shuv1337

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[shuv1337]

Closing — trivial micro-optimization (list multiplication for backspace args), duplicate of #52, and superseded by #57 which covers typer improvements. Jules-generated noise.