Align donation buttons with main grid style

[TimUx]

Summary

• restyle donation amount links to reuse the main button gradient and card-like treatment
• arrange donation buttons in a three-column grid with responsive fallback to keep them compact

Testing

• python -m py_compile app.py

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Codex Task

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/TimUx/fpp-control/blob/c05f195979cc969a51216e3906e2c1a2af17f76c/app.py#L458-L462
Enforce access code on control APIs

When ACCESS_CODE is configured, the UI hides the controls until the code is entered, but the backend routes still execute without any authentication. A direct POST to /api/show or /api/requests will start playlists or enqueue songs even if the access code was never provided, so anyone who can reach the service can bypass the gate entirely. Consider rejecting these requests unless a validated token/code is supplied to keep the access code meaningful.

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