Combine nested conditionals in WorldFocusedHandler

[Copilot]

Addresses review feedback from PR #8 to combine redundant nested if statements.

Changes

• Merged if (world != null) and if (!Interlocked.CompareExchange(...)) into single conditional using && operator
• Reduced indentation level in WorldFocusedHandler local function

// Before
if (world != null)
{
    if (!Interlocked.CompareExchange(ref _initialized, true, false))
    {
        // initialization logic
    }
}

// After
if (world != null && !Interlocked.CompareExchange(ref _initialized, true, false))
{
    // initialization logic
}

Behavior unchanged due to short-circuit evaluation.

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