Drop frequency of contact sync task, make standard polling opt-in only

frontend/src/components/ChatHeader.tsx

@@ -51,6 +51,14 @@ export function ChatHeader({
   const titleClickable =
     (conversation.type === 'contact' && onOpenContactInfo) ||
     (conversation.type === 'channel' && onOpenChannelInfo);
+  const favoriteTitle =
+    conversation.type === 'contact'
+      ? isFavorite(favorites, 'contact', conversation.id)
+        ? 'Remove from favorites. Favorite contacts stay loaded on the radio for ACK support.'
+        : 'Add to favorites. Favorite contacts stay loaded on the radio for ACK support.'
+      : isFavorite(favorites, conversation.type as 'channel' | 'contact', conversation.id)
+        ? 'Remove from favorites'
+        : 'Add to favorites';
 
   const handleEditFloodScopeOverride = () => {
     if (conversation.type !== 'channel' || !onSetChannelFloodScopeOverride) return;
@@ -184,11 +192,7 @@ export function ChatHeader({
             onClick={() =>
               onToggleFavorite(conversation.type as 'channel' | 'contact', conversation.id)
             }
-            title={
-              isFavorite(favorites, conversation.type as 'channel' | 'contact', conversation.id)
-                ? 'Remove from favorites'
-                : 'Add to favorites'
-            }
+            title={favoriteTitle}
             aria-label={
               isFavorite(favorites, conversation.type as 'channel' | 'contact', conversation.id)
                 ? 'Remove from favorites'

frontend/src/components/ContactInfoPane.tsx

@@ -279,6 +279,7 @@ export function ContactInfoPane({
                 type="button"
                 className="text-sm flex items-center gap-2 hover:text-primary transition-colors"
                 onClick={() => onToggleFavorite('contact', contact.public_key)}
+                title="Favorite contacts stay loaded on the radio for ACK support"
               >
                 {isFavorite(favorites, 'contact', contact.public_key) ? (
                   <>

frontend/src/components/RepeaterDashboard.tsx

@@ -111,7 +111,11 @@ export function RepeaterDashboard({
           <button
             className="p-1.5 rounded hover:bg-accent text-lg leading-none transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
             onClick={() => onToggleFavorite('contact', conversation.id)}
-            title={isFav ? 'Remove from favorites' : 'Add to favorites'}
+            title={
+              isFav
+                ? 'Remove from favorites. Favorite contacts stay loaded on the radio for ACK support.'
+                : 'Add to favorites. Favorite contacts stay loaded on the radio for ACK support.'
+            }
             aria-label={isFav ? 'Remove from favorites' : 'Add to favorites'}
           >
             {isFav ? (

frontend/src/components/settings/SettingsRadioSection.tsx

@@ -575,8 +575,7 @@ export function SettingsRadioSection({
           onChange={(e) => setMaxRadioContacts(e.target.value)}
         />
         <p className="text-xs text-muted-foreground">
-          Favorite contacts load first, then recent non-repeater contacts until this limit is
-          reached (1-1000)
+          Favorite contacts stay loaded on the radio for DM ACK support up to this limit (1-1000)
         </p>
       </div>