feat(view): move all 3D info panels to the right stack (부재 표시, 시점, 색 기준, 원점)

The four panels are in one stack on the right of the 3D view, 180 px wide, with the ⓘ origin note opening to its left.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

index.html

@@ -76,7 +76,7 @@
             <h2 id="viewer-title">교각 3D 뷰</h2>
           </div>
           <div id="canvas" class="canvas" aria-label="교각 3D 뷰"></div>
-          <div class="viewer-stack viewer-stack-left">
+          <div class="viewer-stack viewer-stack-right">
             <details class="info-panel parts-info" id="parts-info">
               <summary>부재 표시 <span id="parts-count" class="panel-state"></span></summary>
               <div id="parts"></div>