fix(ui): use label click instead of checkbox id for scheduler disable

Checkbox id brittle. Label click more reliable in robot tests.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/robot/ui/settings_modal.robot

@@ -68,7 +68,7 @@ Edit Scheduler Settings
 Disable Scheduler
     [Documentation]    Uncheck scheduler enabled and save.
     Open Settings Modal
-    Uncheck Checkbox    id=scheduled-rescan-enabled
+    Click    xpath=//label[contains(., 'Enable Scheduler')]
     Save Settings
     Toast Should Contain    saved