fix: render hint popover via FloatingPortal to prevent overflow clipping

The popover was invisible because it rendered inside the table's
overflow-x:auto scroll container. FloatingPortal moves it to document.body.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/react/controllers/ActorPopover.jsx

@@ -1,5 +1,5 @@
 import React, { useState } from 'react';
-import { useFloating, useClick, useDismiss, useInteractions, offset, shift, size } from '@floating-ui/react';
+import { useFloating, useClick, useDismiss, useInteractions, offset, shift, size, FloatingPortal } from '@floating-ui/react';
 
 const HINT_ICONS = {
     film: 'fa-solid fa-film',
@@ -46,6 +46,7 @@ export default function ActorPopover({ hintType, hintText }) {
                 <i className={iconClass}></i>
             </button>
             {isOpen && (
+                <FloatingPortal>
                     <div
                         ref={refs.setFloating}
                         style={floatingStyles}
@@ -54,6 +55,7 @@ export default function ActorPopover({ hintType, hintText }) {
                     >
                         {hintText}
                     </div>
+                </FloatingPortal>
             )}
         </>
     );