[dev-v5] fix: conditional AutoFocus

🐛 Bug Report

The AutoFocus parameter does not work when a component is being rendered conditionally.

💻 Repro or Code Sample

<FluentSwitch @bind-Value="showInput" Label="Show Input" />

<br />

@if (showInput)
{
    <FluentTextInput @bind-Value="test" Label="Test" Autofocus />
}

@code {
    private string test = string.Empty;
    private bool showInput;
}

1. Run code
2. Press the switch
3. Notice that the input won't get focused

🤔 Expected Behavior

The input should become focused once it is visible

😯 Current Behavior

The input will become visible but won't be set in focus.

💁 Possible Solution

🔦 Context

If you just render the component without the if then it actually will get focused.

🌍 Your Environment

• OS & Device: Windows 11 64 Bit
• Browser latest Firefox, Chrome, Edge
• latest dev-v5 branch

Start with the FluentTextInput component and its Autofocus behavior, using the Razor reproduction with FluentSwitch and conditional rendering. Reproduce the issue by toggling showInput, then trace how focus is applied when the input becomes visible. Done means the conditionally rendered input receives focus consistently, while the existing always-rendered behavior remains intact.