{{-- Wiederverwendbarer runder Avatar (N6): Profilfoto oder Initialen-Fallback.
     Parameter: imageUrl (string|null), firstName, lastName, size (px, default 48). --}}
@php
    $avatarSize = (int) ($size ?? 48);
    $avatarInitials = mb_strtoupper(mb_substr(trim($firstName ?? ''), 0, 1) . mb_substr(trim($lastName ?? ''), 0, 1));
    $avatarInitials = $avatarInitials !== '' ? $avatarInitials : '?';
@endphp
@if (!empty($imageUrl))
    <img src="{{ $imageUrl }}" alt="{{ trim(($firstName ?? '') . ' ' . ($lastName ?? '')) }}" class="rounded-circle"
        style="width: {{ $avatarSize }}px; height: {{ $avatarSize }}px; object-fit: cover; flex: 0 0 auto;">
@else
    <div class="rounded-circle bg-secondary text-white d-inline-flex align-items-center justify-content-center font-weight-bold"
        style="width: {{ $avatarSize }}px; height: {{ $avatarSize }}px; font-size: {{ (int) round($avatarSize * 0.4) }}px; flex: 0 0 auto;">
        {{ $avatarInitials }}</div>
@endif