Add some toasts

app/views/layouts/_toast.html.slim

@@ -0,0 +1,8 @@
+.toast class="#{alert ? "text-bg-danger" : ""}" role="alert" aria-live="assertive" aria-atomic="true" data={ controller: "toast" }
+  .toast-header
+    /img src="..." class="rounded me-2" alt="...">
+    /strong.me-auto = heading
+    .small.me-auto = l(Time.current.to_time)
+    button.btn-close type="button" data-bs-dismiss="toast" aria-label="Schliessen"
+  .toast-body
+    = content

app/views/layouts/application.html.slim

@@ -16,5 +16,12 @@ html data-bs-theme="#{cookies[:"modeTheme"] || "light"}" data-controller="set-th
         main.col.ps-md-2.pt-2
           #main-content[data-controller="rich-text-link-targets"]
             = yield
+    
+    .toast-container.position-fixed.bottom-0.start-0.p-3 id="toasts"
+      - if flash.alert
+        = render partial: "layouts/toast", locals: { content: flash.alert, alert: true }
+      - if flash.notice
+        = render partial: "layouts/toast", locals: { content: flash.notice, alert: false }
+
     /footer.container-fluid.mt-auto.border-top
       = Rails.configuration.build_version && "Version: #{Rails.configuration.build_version}"