feat: Add new chat and resize input

src/components/chat/ChatInput.tsx

@@ -90,7 +90,7 @@ export const ChatInput = ({ onSendMessage }: ChatInputProps) => {
             onChange={(e) => setMessage(e.target.value)}
             onKeyDown={handleKeyDown}
             placeholder="Digite sua mensagem..."
-            className="min-h-[60px] max-h-[200px] resize-none border-0 bg-transparent focus-visible:ring-0 focus-visible:ring-offset-0 pr-24"
+            className="min-h-[60px] max-h-[400px] resize-y border-0 bg-transparent focus-visible:ring-0 focus-visible:ring-offset-0 pr-24"
           />
           
           <div className="absolute right-2 bottom-2 flex items-center gap-1">

src/components/chat/ChatSidebar.tsx

@@ -46,9 +46,10 @@ interface ChatFolder {
 interface ChatSidebarProps {
   isCollapsed: boolean;
   onToggleCollapse: () => void;
+  onNewChat: () => void;
 }
 
-export const ChatSidebar = ({ isCollapsed, onToggleCollapse }: ChatSidebarProps) => {
+export const ChatSidebar = ({ isCollapsed, onToggleCollapse, onNewChat }: ChatSidebarProps) => {
   const [searchQuery, setSearchQuery] = useState("");
   const [isCreateFolderOpen, setIsCreateFolderOpen] = useState(false);
   const [isEditFolderOpen, setIsEditFolderOpen] = useState(false);
@@ -218,7 +219,7 @@ export const ChatSidebar = ({ isCollapsed, onToggleCollapse }: ChatSidebarProps)
           />
         </div>
 
-        <Button className="w-full gap-2 cyber-glow" variant="default">
+        <Button className="w-full gap-2 cyber-glow" variant="default" onClick={onNewChat}>
           <Plus className="w-4 h-4" />
           Novo Chat
         </Button>

src/components/chat/ChatView.tsx

@@ -20,6 +20,7 @@ interface Message {
 export const ChatView = () => {
   const [isChatSidebarCollapsed, setIsChatSidebarCollapsed] = useState(false);
   const [selectedModel, setSelectedModel] = useState("ChatGPT 4.1");
+  const [currentChatId, setCurrentChatId] = useState("1");
   const [messages, setMessages] = useState<Message[]>([
     {
       id: "1",
@@ -31,6 +32,19 @@ export const ChatView = () => {
 
   const [isLoading, setIsLoading] = useState(false);
 
+  const handleNewChat = () => {
+    const newChatId = Date.now().toString();
+    setCurrentChatId(newChatId);
+    setMessages([
+      {
+        id: "1",
+        role: "assistant",
+        content: "Olá! Sou o assistente HGTX Codex. Como posso ajudá-lo hoje?",
+        model: selectedModel,
+      },
+    ]);
+  };
+
   const handleSendMessage = (content: string, files?: File[]) => {
     const newMessage: Message = {
       id: Date.now().toString(),
@@ -66,6 +80,7 @@ export const ChatView = () => {
       <ChatSidebar 
         isCollapsed={isChatSidebarCollapsed}
         onToggleCollapse={() => setIsChatSidebarCollapsed(!isChatSidebarCollapsed)}
+        onNewChat={handleNewChat}
       />
 
       {/* Main Chat Area */}