feat: live updates on shared shopping lists

Polls item state every 4s and merges it into the list view, guarding
any item with an in-flight local edit so a poll landing mid-edit can't
stomp on it. No websocket/SSE infra exists in this app yet, so this
follows the same polling convention already used for notifications and
message threads.

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

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.10.0";
+export const APP_VERSION = "0.11.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.11.0",
+    date: "2026-07-13 12:27",
+    added: [
+      "**Live updates on shared shopping lists**: items checked, added, recategorized, or reordered by a collaborator now appear automatically, without a manual refresh.",
+    ],
+  },
   {
     version: "0.10.0",
     date: "2026-07-13 11:55",