feat(pose_3d): rinomina sezione Tags + controlli Allinea cross-camera

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/index.html

@@ -449,6 +449,12 @@
             <input id="p3D435ScaleXY" type="number" min="0.1" max="3" step="0.01" value="0.65" style="width:60px">
           </label>
         </div>
+        <div class="p3-row" title="Calibrazione persistente Nuwa→frontale via tag condiviso (Umeyama). Premi Allinea con il tag visto da entrambe le camere.">
+          <label><input type="checkbox" id="p3AlignEnabled"> Allinea Nuwa→frontale</label>
+          <label>tag id <input id="p3AlignTagId" type="number" min="0" max="999" value="0" style="width:55px"></label>
+          <button id="p3AlignBtn">Allinea</button>
+        </div>
+        <div class="marker-info" id="p3AlignStatus">—</div>
         <div class="p3-row">
           <label>step <input id="p3CloudStep" type="number" min="1" max="32" value="8" style="width:50px"></label>
           <label>max <input id="p3CloudMaxDepth" type="number" min="100" max="5000" step="100" value="2000" style="width:70px"> mm</label>
@@ -511,7 +517,7 @@
       </div>
 
       <div class="p3-section">
-        <h3>Tag camera frontale</h3>
+        <h3>Tags</h3>
         <div class="p3-row">
           <label><input type="checkbox" id="p3ShowFrontTags"> Mostra tag visibili (quad + dim + dist)</label>
         </div>