🐛 Show the themes permission message only to non-editors (#12203)

The theme selector showed "You need to be an editor to use themes"
whenever tokens could not be edited. That is also the case for editors
when the tokens source is a library, and they can still switch themes.
Base the message on file edit permission instead.

Closes #12177

AI-assisted-by: claude-opus-5-5

frontend/src/app/main/ui/workspace/tokens/themes.cljs

@@ -23,6 +23,9 @@
   (let [ordered-themes
         (mf/deref refs/workspace-token-themes-no-hidden)
 
+        can-edit-file?
+        (mf/use-ctx ctx/can-edit?)
+
         can-edit-tokens?
         (mf/use-ctx ctx/can-edit-tokens?)
 
@@ -50,6 +53,6 @@
                        :class (stl/css :edit-theme-button)
                        :on-click open-modal}
            (tr "labels.edit")]]
-         [:div {:title (when-not can-edit-tokens?
+         [:div {:title (when-not can-edit-file?
                          (tr "workspace.tokens.no-permission-themes"))}
           [:> theme-selector* {:tokens-source tokens-source}]]))]))