fix: x-data sans window. prefix + suppression x-for inutile

- Changé x-data="window._wsInitData" → x-data="_wsInitData"
  (Alpine évalue mieux sans le préfixe global)
- Supprimé <template x-for="node in flatTree"> dans une table cachée
  (x-show="false", jamais visible mais Alpine l'évaluait quand même)

app/templates/local_workspace.html

@@ -1873,7 +1873,7 @@ console.log('FLOWDECK v2.4.6 — IIFE done, _wsInitData keys:', Object.keys(wind
 </script>
 <script>console.log('FLOWDECK v2.4.6 — ws-split about to render, _wsInitData exists:', typeof window._wsInitData !== 'undefined');</script>
 
-<div class="ws-split" x-data="window._wsInitData"
+<div class="ws-split" x-data="_wsInitData"
      @dragover.prevent="onDragOver($event)"
      @dragleave="onDragLeave($event)"
      @drop.prevent="onDrop($event)"
@@ -2240,9 +2240,7 @@ console.log('FLOWDECK v2.4.6 — IIFE done, _wsInitData keys:', Object.keys(wind
   <!-- Old table view kept for backward compat, hidden -->
   <table class="ws-table" x-show="false" style="display:none">
     <thead><tr><th>Name</th><th>Type</th><th>Size</th></tr></thead>
-    <tbody><template x-for="node in flatTree" :key="'t'+node.id">
-      <tr><td x-text="node.name"></td></tr>
-    </template></tbody>
+    <tbody></tbody>
   </table>
 
   <!-- Empty -->