fix(presence): publish online on enable, update auto-idle description

Author: Just-Insane

src/app/features/settings/general/General.tsx

@@ -482,7 +482,7 @@ function Editor({ isMobile }: Readonly<{ isMobile: boolean }>) {
           <SettingTile
             title="Auto-Idle"
             focusId="auto-idle-presence"
-            description="Automatically appear unavailable after 5 minutes of inactivity or when the tab is hidden."
+            description="Automatically appear unavailable after 5 minutes of inactivity or when the app isn't active."
             after={
               <Switch
                 variant="Primary"

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -852,6 +852,11 @@ function PresenceFeature() {
     mx.setSyncPresence(sendPresence ? undefined : SetPresence.Offline);
     // Sliding sync: enable/disable the presence extension on the next poll.
     getSlidingSyncManager(mx)?.setPresenceEnabled(sendPresence);
+    // Explicitly publish online so the server echoes back our presence event,
+    // which lets useUserPresence update the badge immediately.
+    if (sendPresence) {
+      mx.setPresence({ presence: 'online' }).catch(() => {});
+    }
   }, [mx, sendPresence]);
 
   // Auto-idle: set presence to unavailable after 5 minutes of inactivity or