Add favorite cards display on homepage

- Fetch and display users' favorite cards at the top of homepage
- Filter users with fav \!== '0' to avoid empty display
- Use useQueries to fetch multiple users' cards in parallel
- Display cards in grid layout with owner username below
- Cards are shown above the user list section

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/pages/DocsPage.tsx

@@ -85,18 +85,6 @@ export default function DocsPage({ isEnglish = false, page }: DocsPageProps) {
           </tbody>
         </table>
 
-        <h3>{isEnglish ? 'Battle' : '対戦について'}</h3>
-        <p><code>@yui.syui.ai /card -b</code></p>
-        <p>{isEnglish ? 'Random match, one of the top 3 cards on hand will be chosen at random' : 'ランダムマッチ、手持ちの上位3枚のうち1枚がランダムで選ばれます'}</p>
-
-        <h3>Mastodon</h3>
-        <p>
-          <code>
-            <a href="https://mstdn.syui.ai/@yui" target="_blank" rel="noopener noreferrer">
-              @yui@syui.ai
-            </a> /card
-          </code>
-        </p>
       </div>
     );
   };

src/components/pages/HomePage.tsx

@@ -1,6 +1,8 @@
-import { useQuery } from '@tanstack/react-query';
+import { useQuery, useQueries } from '@tanstack/react-query';
 import Navigation from '../common/Navigation';
-import { fetchUsers } from '../../utils/api';
+import { fetchUsers, fetchUserCards } from '../../utils/api';
+import SpecialCard from '../card/SpecialCard';
+import type { Card } from '../../types';
 
 export default function HomePage() {
   
@@ -9,6 +11,30 @@ export default function HomePage() {
     queryFn: () => fetchUsers()
   });
 
+  // Get all users with fav cards
+  const usersWithFav = users?.data?.filter(user => user.fav && user.fav !== '0') || [];
+  
+  // Fetch cards for each user with fav
+  const favCardQueries = useQueries({
+    queries: usersWithFav.map(user => ({
+      queryKey: ['userCards', user.id],
+      queryFn: () => fetchUserCards(user.id),
+      enabled: !!user.id
+    }))
+  });
+
+  // Extract fav cards
+  const favCards: { user: typeof usersWithFav[0], card: Card }[] = [];
+  usersWithFav.forEach((user, index) => {
+    const userCards = favCardQueries[index]?.data?.data;
+    if (userCards && user.fav) {
+      const favCard = userCards.find(card => card.id === parseInt(user.fav));
+      if (favCard) {
+        favCards.push({ user, card: favCard });
+      }
+    }
+  });
+
   if (isLoading) {
     return (
       <div className="min-h-screen flex items-center justify-center">
@@ -28,6 +54,25 @@ export default function HomePage() {
           <a href="/docs" className="btn">help</a>
         </div>
 
+        {/* Favorite Cards Section */}
+        {favCards.length > 0 && (
+          <div className="mb-8">
+            <h2 className="text-xl font-bold mb-4">Favorite Cards</h2>
+            <div className="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
+              {favCards.map(({ user, card }) => (
+                <div key={`${user.id}-${card.id}`}>
+                  <SpecialCard card={card} />
+                  <div className="text-center text-sm mt-2">
+                    <a href={`/${user.username}`} className="text-gray-600 hover:text-primary">
+                      @{user.username}
+                    </a>
+                  </div>
+                </div>
+              ))}
+            </div>
+          </div>
+        )}
+
         {users?.data && Array.isArray(users.data) && users.data.length > 0 && (
           <div className="bg-white rounded-lg p-6">
             <div className="grid gap-4">

src/utils/api.ts

@@ -52,6 +52,16 @@ export const fetchUserCards = async (userId: number, itemsPerPage = 8000): Promi
   }
 };
 
+export const fetchCardById = async (cardId: number): Promise<Card | null> => {
+  try {
+    const response = await api.get(`cards/${cardId}`);
+    return response.data;
+  } catch (error) {
+    console.error('Failed to fetch card by ID:', error);
+    return null;
+  }
+};
+
 export const fetchUser = async (userId: number): Promise<{ data: User }> => {
   const response = await api.get(`users/${userId}`);
   return response.data;