UX: landscape result screen, chat emojis, unread badges, remove XP text

- PostMatchRewardsModal: short-height (landscape) compaction so the win/forfeit
  result fits without overflow (smaller emoji/coins/padding, max-h 94dvh, wider).
- Chat: emoji/sticker picker (owned reactions) — tap to send; hidden on focus.
- Unread messages: online-store now tracks a total `unread` (from
  listConversations); NavRail Friends icon shows a badge (unread + requests),
  refreshed every 12s on every screen; Friends «پیام‌ها» tab badged too.
  (Per-conversation unread badges already existed.)
- Remove "XP گران است" / "XP is expensive" from shop.xpHint.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/online-store.ts

@@ -41,9 +41,11 @@ interface OnlineStore {
   // chat
   activeChatFriend: Friend | null;
   chatMessages: ChatMessage[];
+  unread: number; // total unread messages across conversations (for nav badge)
   openChat: (friend: Friend) => Promise<void>;
   sendChat: (text: string) => Promise<void>;
   closeChat: () => void;
+  refreshUnread: () => Promise<void>;
 }
 
 let roomUnsub: (() => void) | null = null;
@@ -154,11 +156,22 @@ export const useOnlineStore = create<OnlineStore>((set, get) => ({
 
   activeChatFriend: null,
   chatMessages: [],
+  unread: 0,
+
+  refreshUnread: async () => {
+    try {
+      const convs = await getService().listConversations();
+      set({ unread: convs.reduce((n, c) => n + (c.unread ?? 0), 0) });
+    } catch {
+      /* ignore */
+    }
+  },
 
   openChat: async (friend) => {
     const svc = getService();
     set({ activeChatFriend: friend, chatMessages: await svc.getMessages(friend.id) });
     await svc.markRead(friend.id);
+    get().refreshUnread();
     if (chatUnsub) chatUnsub();
     chatUnsub = svc.onChat((friendId, msgs) => {
       const active = get().activeChatFriend;
@@ -182,5 +195,6 @@ export const useOnlineStore = create<OnlineStore>((set, get) => ({
       chatUnsub = null;
     }
     set({ activeChatFriend: null, chatMessages: [] });
+    get().refreshUnread();
   },
 }));