Don't load full right away

frontend/src/components/settings/SettingsRadioSection.tsx

@@ -575,7 +575,8 @@ export function SettingsRadioSection({
           onChange={(e) => setMaxRadioContacts(e.target.value)}
         />
         <p className="text-xs text-muted-foreground">
-          Favorite contacts stay loaded on the radio for DM ACK support up to this limit (1-1000)
+          Configured radio contact capacity. Favorites reload first, then background maintenance
+          refills to about 80% of this value and offloads once occupancy reaches about 95%.
         </p>
       </div>
 

frontend/src/test/settingsModal.test.tsx

@@ -184,9 +184,7 @@ describe('SettingsModal', () => {
     openRadioSection();
 
     expect(
-      screen.getByText(
-        /Favorite contacts stay loaded on the radio for DM ACK support up to this limit/i
-      )
+      screen.getByText(/Configured radio contact capacity/i)
     ).toBeInTheDocument();
   });