feat: update next sprint tasks and demo notes with new tracking and UI suggestions

demos/m3/m3-notes.md

@@ -9,6 +9,9 @@
 - **Flickering company name:** Every time I navigate to the home screen, I see "your company" for a moment before it changes to the real name.
 - Creating a One-Time Order shows "No Vendors Available" — this is expected, OK.
 
+**Suggestions: Achintha:**
+- We need to have a shimmer loading state while fetching data, to avoid flickering and empty states.
+
 ---
 
 ## Demo 2: Register Staff & Show Empty States (Staff App)