feat(market): add Minha Intenções tab with panel, hook, and badge

- Introduced "Minhas Intenções" tab visible only to logged-in users.
- Integrated MyPurchaseIntentionsPanel and useMyPurchaseIntentions hook.
- Added tab badge showing count of pending intentions.
- Extended session API to include user’s main character for downstream features.

components/Header.tsx

@@ -12,6 +12,7 @@ import { ThemeToggle } from "./theme-toggle";
 import { LanguageSwitcher } from "./language-switcher";
 import { MobileMenu } from "./mobile-menu";
 import { NotificationBell } from "./notifications/NotificationBell";
+import { MessagesBell } from "./messages/MessagesBell";
 import { LoginDialog } from "./auth/login-dialog";
 import { RegisterDialog } from "./auth/register-dialog";
 import { Button } from "@/components/ui/button";
@@ -97,6 +98,9 @@ export default function Header() {
           <ThemeToggle />
           <LanguageSwitcher />
           
+          {/* Messages */}
+          {mounted && isAuthenticated && <MessagesBell />}
+          
           {/* Notifications */}
           {mounted && isAuthenticated && <NotificationBell />}
           
@@ -123,6 +127,11 @@ export default function Header() {
                     <p className="text-sm font-medium leading-none">
                       {user.username}
                     </p>
+                    {user.characterName && (
+                      <p className="text-xs leading-none text-primary font-medium">
+                        {user.characterName}
+                      </p>
+                    )}
                     <p className="text-xs leading-none text-muted-foreground">
                       {user.email}
                     </p>