Change capacity to be optional and fix capacity field

frontend/src/PagesAdmin/EventCreatorAdminPage/EventCreatorAdminPage.tsx

@@ -291,9 +291,7 @@ export function EventCreatorAdminPage() {
           data.duration > 0 &&
           data.category &&
           data.host &&
-          data.location &&
-          data.capacity !== undefined &&
-          data.capacity > 0
+          data.location
         );
       },
       template: (
@@ -406,11 +404,15 @@ export function EventCreatorAdminPage() {
                   <FormLabel>{t(KEY.common_capacity)}</FormLabel>
                   <FormControl>
                     <Input
-                      type="number"
-                      {...field}
+                      type="text"
+                      inputMode="numeric"
+                      name={field.name}
+                      ref={field.ref}
+                      onBlur={field.onBlur}
+                      value={field.value ?? ''}
                       onChange={(e) => {
-                        const v = e.target.value;
-                        field.onChange(v === '' ? '' : Number.parseInt(v));
+                        const v = e.target.value.replace(/\D/g, '');
+                        field.onChange(v);
                       }}
                     />
                   </FormControl>

frontend/src/schema/event.ts

@@ -9,7 +9,15 @@ export const EVENT_DURATION = z.number().min(1, { message: 'Varighet må være s
 export const EVENT_END_DT = z.string().optional();
 export const EVENT_HOST = z.string().min(1, { message: 'Arrangør er påkrevd' });
 export const EVENT_LOCATION = z.string().min(1, { message: 'Lokale er påkrevd' });
-export const EVENT_CAPACITY = z.number().min(1, { message: 'Kapasitet må være større enn 0' }).optional();
+export const EVENT_CAPACITY = z.preprocess((value) => {
+  if (value === '' || value === undefined || value === null) {
+    return undefined;
+  }
+  if (typeof value === 'string') {
+    return Number.parseInt(value, 10);
+  }
+  return value;
+}, z.number().min(1, { message: 'Kapasitet må være større enn 0' }).optional());
 export const EVENT_VISIBILITY_FROM_DT = z.string().min(1, { message: 'Synlig fra dato er påkrevd' });
 export const EVENT_VISIBILITY_TO_DT = z.string().optional();
 export const EVENT_PAID_OPTION = z.string().url().optional();