feat(questions): list and restore removed games

Add a "Removed games" section on the questions page and an Undo
toast after removing a manual game (#39).

src/components/ManualGameCard.jsx

@@ -8,10 +8,12 @@ import {Button} from '@/components/ui/button';
 import {Card} from '@/components/ui/card';
 import {Input} from '@/components/ui/input';
 import {Label} from '@/components/ui/label';
-import {hoursToMinutes, removeGame, toHours, updateManualGame} from '../utils/manualGames.js';
+import {hoursToMinutes, removeGame, restoreGame, toHours, updateManualGame} from '../utils/manualGames.js';
 import {MAX_PLATFORM_LENGTH} from '../utils/limits.js';
 import useUnsavedChanges, {discardChanges} from '../hooks/useUnsavedChanges.js';
 
+const UNDO_MS = 8000;
+
 /**
  * Platform and hours of a game added by hand, and removing it. Steam games get both from the sync.
  *
@@ -54,8 +56,16 @@ export default function ManualGameCard({game, onSaved}) {
         toast.success(t('BACKLOG.SAVED'));
     });
 
+    const undoRemove = () => run(() => restoreGame(game.appid), () => {
+        toast.success(t('REMOVED_GAMES.RESTORED'));
+        navigate(`/library/${game.appid}`);
+    });
+
     const remove = () => run(() => removeGame(game.appid), () => {
-        toast.success(t('MANUAL_GAME.REMOVED'));
+        toast.success(t('MANUAL_GAME.REMOVED'), {
+            duration: UNDO_MS,
+            action: {label: t('MANUAL_GAME.UNDO'), onClick: undoRemove},
+        });
         // The game is gone, so are its unsaved edits on this page.
         discardChanges();
         navigate('/library', {replace: true});