Upgrade to Ink 6 and React 19 (#2096)

Co-authored-by: jacob314 <jacob314@gmail.com>

packages/cli/src/ui/components/shared/MaxSizedBox.tsx

@@ -116,13 +116,15 @@ export const MaxSizedBox: React.FC<MaxSizedBoxProps> = ({
     throw new Error('maxWidth must be defined when maxHeight is set.');
   }
   function visitRows(element: React.ReactNode) {
-    if (!React.isValidElement(element)) {
+    if (!React.isValidElement<{ children?: React.ReactNode }>(element)) {
       return;
     }
+
     if (element.type === Fragment) {
       React.Children.forEach(element.props.children, visitRows);
       return;
     }
+
     if (element.type === Box) {
       layoutInkElementAsStyledText(element, maxWidth!, laidOutStyledText);
       return;
@@ -246,7 +248,10 @@ interface Row {
  * @returns An array of `Row` objects.
  */
 function visitBoxRow(element: React.ReactNode): Row {
-  if (!React.isValidElement(element) || element.type !== Box) {
+  if (
+    !React.isValidElement<{ children?: React.ReactNode }>(element) ||
+    element.type !== Box
+  ) {
     debugReportError(
       `All children of MaxSizedBox must be <Box> elements`,
       element,
@@ -258,7 +263,15 @@ function visitBoxRow(element: React.ReactNode): Row {
   }
 
   if (enableDebugLog) {
-    const boxProps = element.props;
+    const boxProps = element.props as {
+      children?: React.ReactNode | undefined;
+      readonly flexDirection?:
+        | 'row'
+        | 'column'
+        | 'row-reverse'
+        | 'column-reverse'
+        | undefined;
+    };
     // Ensure the Box has no props other than the default ones and key.
     let maxExpectedProps = 4;
     if (boxProps.children !== undefined) {
@@ -323,14 +336,13 @@ function visitBoxRow(element: React.ReactNode): Row {
       return;
     }
 
-    if (!React.isValidElement(element)) {
+    if (!React.isValidElement<{ children?: React.ReactNode }>(element)) {
       debugReportError('Invalid element.', element);
       return;
     }
 
     if (element.type === Fragment) {
-      const fragmentChildren = element.props.children;
-      React.Children.forEach(fragmentChildren, (child) =>
+      React.Children.forEach(element.props.children, (child) =>
         visitRowChild(child, parentProps),
       );
       return;