fix: isolate public subscribe from integration job failures

Queue Weeztix/Mailwizz after the HTTP response and catch dispatch errors.
Jobs log Mailwizz/Weeztix API failures without rethrowing so sync driver
and terminating callbacks do not surface 500s after a successful create.

Add JS fallback for non-JSON error responses, deployment note, and a
regression test for failing Mailwizz under QUEUE_CONNECTION=sync.

Made-with: Cursor

resources/js/app.js

@@ -555,12 +555,21 @@ document.addEventListener('alpine:init', () => {
                     this.startRedirectCountdownIfNeeded();
                     return;
                 }
-                if (typeof data.message === 'string' && data.message !== '') {
+                const hasServerMessage = typeof data.message === 'string' && data.message !== '';
+                const hasFieldErrors =
+                    data.errors !== undefined &&
+                    data.errors !== null &&
+                    typeof data.errors === 'object' &&
+                    Object.keys(data.errors).length > 0;
+                if (hasServerMessage) {
                     this.formError = data.message;
                 }
-                if (data.errors !== undefined && data.errors !== null && typeof data.errors === 'object') {
+                if (hasFieldErrors) {
                     this.fieldErrors = data.errors;
                 }
+                if (!res.ok && !hasServerMessage && !hasFieldErrors) {
+                    this.formError = this.genericError;
+                }
             } catch {
                 this.formError = this.genericError;
             } finally {