feat: replace raw setInterval polling with shared Poller utility across six frontend modules

devplacepy/static/js/OptimisticAction.js

@@ -0,0 +1,18 @@
+// retoor <retoor@molodetz.nl>
+
+import { Http } from "./Http.js";
+import { Toast } from "./Toast.js";
+
+export class OptimisticAction {
+    async submit(url, params, errorTarget, render) {
+        try {
+            const result = await Http.sendForm(url, params);
+            if (render) render(result);
+            return result;
+        } catch (error) {
+            console.error("optimistic action failed", error);
+            if (errorTarget) Toast.flash(errorTarget, "Error", 1500);
+            return null;
+        }
+    }
+}