feat: update Mermaid diagrams to follow theme preference (#576)

Tim van Wijk

20.22.2025 902d1bfcae166cf9b0350bb88810e3c0162430a3

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<!-- loading -->
<div class="sk-wrapper">
  <div class="sk-fold">
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
  </div>
</div>