fix(menü): Wiederherstellen nur noch über den Neu-laden-Knopf der Titelzeile (D81-Nachtrag 2)

Das Zeilen-Symbol im Dokumenten-Menü konnte ein UNGEÖFFNETES mitgeliefertes
Dokument zurücksetzen — ohne zu sehen, was man verwirft (Nutzer-Einwand).
Umbenennen und Löschen bleiben je Zeile; restoreDoc() wirkt nur noch auf das
geöffnete Dokument und prüft das selbst.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/examples/werkbaum.werkbaum

@@ -532,9 +532,10 @@
 
 #ed.docs.picker
   The app header reads "Werkbaum > name": the chip opens the menu, grouped by
-  kind (shipped, yours, sources), with rename, delete and restore on each row.
-  It scrolls as a whole instead of being cut off on small screens, and on the
-  phone it is reachable from both panes.
+  kind (shipped, yours, sources), with rename and delete on each row. Restore
+  lives on the editor title bar's reload button instead, acting only on the
+  open document. The menu scrolls as a whole instead of being cut off on
+  small screens, and on the phone it is reachable from both panes.
 
 #ed.docs.url
   A link can carry the address of a text file, which is then fetched on every