web/admin: migrate application form to web

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

web/src/elements/buttons/ModalButton.ts

@@ -54,11 +54,18 @@ export class ModalButton extends LitElement {
         super();
         window.addEventListener("keyup", (e) => {
             if (e.code === "Escape") {
+                this.resetForms();
                 this.open = false;
             }
         });
     }
 
+    resetForms(): void {
+        this.querySelectorAll<HTMLFormElement>("[slot=form]").forEach(form => {
+            form.reset();
+        });
+    }
+
     updateHandlers(): void {
         // Ensure links close the modal
         this.shadowRoot?.querySelectorAll<HTMLAnchorElement>("a").forEach((a) => {