Harden request cache titles and cache-only reads

frontend/app/admin/SettingsPage.tsx

@@ -297,7 +297,8 @@ export default function SettingsPage({ section }: SettingsPageProps) {
     requests_full_sync_time: 'Daily time to refresh the full request list.',
     requests_cleanup_time: 'Daily time to trim old history.',
     requests_cleanup_days: 'History older than this is removed during cleanup.',
-    requests_data_source: 'Pick where Magent should read requests from.',
+    requests_data_source:
+      'Pick where Magent should read requests from. Cache-only avoids Jellyseerr lookups on reads.',
     log_level: 'How much detail is written to the activity log.',
     log_file: 'Where the activity log is stored.',
     site_build_number: 'Build number shown in the account menu (auto-set from releases).',
@@ -1129,7 +1130,9 @@ export default function SettingsPage({ section }: SettingsPageProps) {
                         }
                       >
                         <option value="always_js">Always use Jellyseerr (slower)</option>
-                        <option value="prefer_cache">Use saved requests first (faster)</option>
+                        <option value="prefer_cache">
+                          Use saved requests only (fastest)
+                        </option>
                       </select>
                     </label>
                   )