docs(listing): say the certificate check ships on at 12 hours (#744)

An F-Droid reviewer on fdroiddata!42096 noted the bullet implies a choice
without saying where it starts: Never is an option, not the default. States the
default and where to change it.

Rides the v1.0.10 tag amend rather than a new release — fastlane metadata is
read from the tree at commit:, and neither this file nor the privacy doc it
ships alongside enters the APK, so the published binary is unaffected and
reproducibility against it still holds.

Co-authored-by: Jason Monk <monkopedia@gmail.com>

fastlane/metadata/android/en-US/full_description.txt

@@ -10,6 +10,6 @@
   <li>On-demand — your phone is only reachable while a client is connected, then sleeps again. No always-on background service draining the battery.</li>
   <li>You stay in control — you enable each integration explicitly, and every tool call an AI client makes is recorded in an on-device audit history you can review.</li>
   <li>Private by design — data never leaves the device except through a live, user-approved session.</li>
-  <li>Certificate monitoring — the app checks public transparency logs (crt.sh, or Certspotter as backup) for certificates issued to your device's address, so a forged one doesn't go unnoticed. Runs on an interval you pick, or not at all.</li>
+  <li>Certificate monitoring — the app checks public transparency logs (crt.sh, or Certspotter as backup) for certificates issued to your device's address, so a forged one doesn't go unnoticed. Runs every 12 hours by default; change the interval or turn it off in Settings.</li>
   <li>Free and open source, with no analytics or tracking in the app.</li>
 </ul>