Fix null-checking logic in IndexView.razor

[Copilot]

The null-checking condition Documents?.Any() == false incorrectly handles null values. When Documents is null, null?.Any() returns null, making null == false evaluate to false, which skips the welcome message and proceeds to iterate over Documents!, risking a NullReferenceException.

Changes:

• Changed condition from Documents?.Any() == false to Documents?.Any() != true
• Wrapped foreach loop in else block to ensure it only executes when Documents contains items

@if (Documents?.Any() != true)
{
    <p>Welcome aboard ScissorHands.NET!</p>
}
else
{
    @foreach (var post in Documents!)
    {
        <!-- render post -->
    }
}

This correctly handles all cases:

• Documents is null → null != true → show welcome
• Documents is empty → false != true → show welcome
• Documents has items → true != true → iterate

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