fix(chat): restrict to authenticated users only, fix overlay transparency

apps/web/src/components/chat/Chat.tsx

@@ -342,6 +342,31 @@ export const Chat = forwardRef<ChatRef, ChatProps>(function Chat(
       )}
 
       {/* Input Area */}
+      {!user && (
+        <div className="mx-4 mb-2 lg:mx-auto lg:max-w-4xl lg:px-8">
+          <div
+            className="flex items-center justify-center gap-2 rounded-lg border px-4 py-3 text-center"
+            style={{
+              backgroundColor: "rgb(var(--surface-1))",
+              borderColor: "rgb(var(--border-default))",
+            }}
+          >
+            <svg
+              className="h-4 w-4"
+              style={{ color: "rgb(var(--text-secondary))" }}
+              fill="none"
+              viewBox="0 0 24 24"
+              stroke="currentColor"
+              strokeWidth={2}
+            >
+              <path d="M15 7a2 2 0 012 2m4 0a6 6 0 01-7.743 5.743L11 17H9v2H7v2H4a1 1 0 01-1-1v-2.586a1 1 0 01.293-.707l5.964-5.964A6 6 0 1121 9z" />
+            </svg>
+            <span className="text-sm" style={{ color: "rgb(var(--text-secondary))" }}>
+              Sign in to chat with Jarvis
+            </span>
+          </div>
+        </div>
+      )}
       <div
         className="sticky bottom-0 border-t"
         style={{
@@ -352,7 +377,7 @@ export const Chat = forwardRef<ChatRef, ChatProps>(function Chat(
         <div className="mx-auto max-w-4xl px-4 py-4 lg:px-8">
           <ChatInput
             onSend={handleSendMessage}
-            disabled={isChatLoading}
+            disabled={isChatLoading || !user}
             inputRef={inputRef}
             isStreaming={isStreaming}
             onStopStreaming={abortStream}