fix: preserve recipe progress view state

Refs #1, #5

README.md

@@ -20,7 +20,8 @@ link; it should look like `https://cloud.example.test/s/SHARE_TOKEN`.
   config: {
     shareUrl: "https://cloud.example.test/s/SHARE_TOKEN",
     controlUrl: "http://mirror.example.test:8080/MMM-NextcloudCookbook/control",
-    layout: "stacked"
+    layout: "stacked",
+    theme: "light"
   }
 }
 ```
@@ -38,6 +39,9 @@ the controller and recipe overlay also offer a toggle, and the chosen theme is
 saved locally. After exiting recipe mode, use **Resume last recipe** in the
 controller to restore its portions and completion marks.
 
+Ingredients and instructions can be marked complete from either the phone
+controller or a touchscreen on the mirror; both views remain synchronized.
+
 When portions change, the display shows both the selected yield and the
 recipe's original yield. Ingredients without a leading quantity are marked in
 yellow because they cannot be scaled; unsupported or imprecise numeric scaling