fix: var _wsInitData globale + anti-cache headers HTML

- x-data="_wsInitData" référence la variable globale JS (pas window.)
- var _wsInitData = IIFE — propriété window automatique pour compatibilité window._wsData
- Headers Cache-Control: no-cache, no-store, must-revalidate sur la page HTML
- 73 tests OK

app/routers/dashboard.py

@@ -542,7 +542,14 @@ async def local_workspace_page(request: Request, folder: int = None):
         "breadcrumb": breadcrumb,
     }
     template = env.get_template("local_workspace.html")
-    return template.render(**ctx)
+    return HTMLResponse(
+        content=template.render(**ctx),
+        headers={
+            "Cache-Control": "no-cache, no-store, must-revalidate",
+            "Pragma": "no-cache",
+            "Expires": "0",
+        }
+    )
 
 
 @router.get("/api/local-workspace/tree")