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/chat/MessageInput.tsx

@@ -0,0 +1,88 @@
+"use client";
+
+import { useState, KeyboardEvent } from "react";
+import { Button } from "@/components/ui/button";
+import { Textarea } from "@/components/ui/textarea";
+import { Send, Loader2 } from "lucide-react";
+import { useChatTyping } from "@/lib/hooks/use-chat";
+import { useSocket } from "@/lib/hooks/use-socket";
+
+interface MessageInputProps {
+  onSend: (content: string) => Promise<void>;
+  isSending: boolean;
+  disabled?: boolean;
+  chatId: string | null;
+}
+
+export function MessageInput({
+  onSend,
+  isSending,
+  disabled = false,
+  chatId,
+}: MessageInputProps) {
+  const [content, setContent] = useState("");
+  const { socket, isConnected } = useSocket();
+  const { handleTypingStart, handleTypingStop } = useChatTyping(
+    socket,
+    isConnected,
+    chatId
+  );
+
+  const handleSubmit = async () => {
+    if (!content.trim() || isSending || disabled) return;
+
+    const messageContent = content.trim();
+    setContent("");
+    handleTypingStop();
+    await onSend(messageContent);
+  };
+
+  const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (e.key === "Enter" && !e.shiftKey) {
+      e.preventDefault();
+      handleSubmit();
+    }
+  };
+
+  const handleChange = (value: string) => {
+    setContent(value);
+    
+    if (value.trim().length > 0) {
+      handleTypingStart();
+    } else {
+      handleTypingStop();
+    }
+  };
+
+  return (
+    <div className="border-t p-4">
+      <div className="flex items-end gap-2">
+        <Textarea
+          value={content}
+          onChange={(e) => handleChange(e.target.value)}
+          onKeyDown={handleKeyDown}
+          placeholder="Digite sua mensagem... (Enter para enviar, Shift+Enter para nova linha)"
+          className="min-h-[60px] max-h-[120px] resize-none"
+          disabled={isSending || disabled}
+          rows={2}
+        />
+        <Button
+          onClick={handleSubmit}
+          disabled={!content.trim() || isSending || disabled}
+          size="icon"
+          className="h-[60px] w-[60px] flex-shrink-0"
+        >
+          {isSending ? (
+            <Loader2 className="h-5 w-5 animate-spin" />
+          ) : (
+            <Send className="h-5 w-5" />
+          )}
+        </Button>
+      </div>
+      <p className="text-xs text-muted-foreground mt-2">
+        Máximo 1000 caracteres
+      </p>
+    </div>
+  );
+}
+