Keep a pending idle action on its deadline when the timings change

With 0 meaning off, setting the screensaver to 0 while the screensaver is up moves the first idle deadline to the lock's, which turns the pending lock's bound interval to 0 and locks at once, minutes early. Set each timer's interval when the cycle starts, so a change to shell.json takes effect from the next cycle.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Codex Medium <noreply@openai.com>

shell/plugins/services/idle/Service.qml

@@ -94,14 +94,22 @@ Item {
     root.screensaverStartedThisCycle = false
     resetScreensaverWindows()
 
+    // Set this cycle's deadlines once: a bound interval would restart a pending
+    // timer from the moment shell.json changes, locking early or late.
     if (root.screensaverEnabled) {
       if (root.screensaverDelaySeconds === 0) launchScreensaver()
-      else screensaverTimer.restart()
+      else {
+        screensaverTimer.interval = root.screensaverDelaySeconds * 1000
+        screensaverTimer.restart()
+      }
     }
 
     if (root.lockEnabled) {
       if (root.lockDelaySeconds === 0) lockSystem("lock-timeout-immediate")
-      else lockTimer.restart()
+      else {
+        lockTimer.interval = root.lockDelaySeconds * 1000
+        lockTimer.restart()
+      }
     }
   }
 
@@ -265,14 +273,12 @@ Item {
 
   Timer {
     id: screensaverTimer
-    interval: root.screensaverDelaySeconds * 1000
     repeat: false
     onTriggered: if (root.screensaverEnabled) root.launchScreensaver()
   }
 
   Timer {
     id: lockTimer
-    interval: root.lockDelaySeconds * 1000
     repeat: false
     onTriggered: if (root.idleEnabled && root.idledThisCycle && root.lockEnabled) root.lockSystem("lock-timeout")
   }