feat(scheduled-ops): add scheduled operations for Team Pro users (#231)

Adds the ability to schedule recurring Docker operations (stack restarts,
fleet snapshots, system prunes) via cron expressions with full execution
history logging. Includes Run Now for on-demand execution.

frontend/src/components/SSOSection.tsx

@@ -338,7 +338,7 @@ export function SSOSection() {
                     </h3>
                     <p className="text-sm text-muted-foreground mt-1">
                         Connect your identity provider so team members can sign in with their existing credentials.
-                        SSO works alongside password authentication — it does not replace it.
+                        SSO works alongside password authentication - it does not replace it.
                     </p>
                 </div>