Make prompt() to return null on cancel

src-web/components/core/Dialog.tsx

@@ -10,7 +10,7 @@ import { IconButton } from './IconButton';
 export interface DialogProps {
   children: ReactNode;
   open: boolean;
-  onClose: () => void;
+  onClose?: () => void;
   title?: ReactNode;
   description?: ReactNode;
   className?: string;
@@ -44,7 +44,7 @@ export function Dialog({
     'Escape',
     () => {
       if (!open) return;
-      onClose();
+      onClose?.();
     },
     {},
     [open],

src-web/components/core/Input.tsx

@@ -26,7 +26,7 @@ export type InputProps = Omit<
   > & {
     name?: string;
     type?: 'text' | 'password';
-    label: string;
+    label: ReactNode;
     hideLabel?: boolean;
     labelPosition?: 'top' | 'left';
     labelClassName?: string;

src-web/components/core/PairEditor.tsx

@@ -512,7 +512,7 @@ function PairEditorRow({
               leftSlot: <Icon icon="pencil" />,
               hidden: !pairContainer.pair.isFile,
               onSelect: async () => {
-                const v = await prompt({
+                const contentType = await prompt({
                   id: 'content-type',
                   require: false,
                   title: 'Override Content-Type',
@@ -522,7 +522,8 @@ function PairEditorRow({
                   confirmText: 'Set',
                   description: 'Leave blank to auto-detect',
                 });
-                handleChangeValueContentType(v);
+                if (contentType == null) return;
+                handleChangeValueContentType(contentType);
               },
             },
             {