style(editor): drop fixed max-width on rotor SVG — let it fill the panel

Was capped at 600 px and horizontally centred. Removing both lets the SVG
expand to the editor column width, which on wider screens stops the
diagram from sitting in a narrow stripe with empty margins.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

rotatingMachine.html

@@ -307,7 +307,7 @@
   <!-- ============================================================ -->
   <div style="margin: 4px 0 14px 0; background: #fafcff; border: 1px solid #d9e6f2; border-radius: 4px; padding: 8px;">
     <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 200"
-         style="display:block;width:100%;max-width:600px;margin:0 auto;"
+         style="display:block;width:100%;"
          font-family="Arial,sans-serif" font-size="11">
       <defs>
         <marker id="rm-arrow-flow" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="8" markerHeight="8" orient="auto-start-reverse">