(chore): manual fetch SvelteKit actions

web/src/lib/fetch-action.ts

@@ -0,0 +1,25 @@
+export interface Request extends Omit<RequestInit, 'url'> {
+  action?: string;
+  form?: Record<string, string>;
+}
+
+export default function fetchAction(request: Request): Promise<Response> {
+  return fetch(request.action ?? '/', {
+    ...request,
+    method: request.method ?? 'GET',
+    headers: {
+      ...request.headers,
+      'X-Sveltekit-Action': 'true',
+    },
+    body: request.form ? createFormData(request.form) : request.body || undefined,
+  });
+}
+
+function createFormData(data: Record<string, string>): FormData {
+  const form = new FormData();
+  for (const key in data) {
+    if (typeof data[key] !== 'string') continue;
+    form.set(key, data[key]);
+  }
+  return form;
+}