fix(chat): prevent duplicate renderer requests and thinking messages (#870)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Haze <hazeone@users.noreply.github.com>

src/pages/Chat/ChatInput.tsx

@@ -491,6 +491,7 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false, i
                 onPaste={handlePaste}
                 placeholder={disabled ? t('composer.gatewayDisconnectedPlaceholder') : ''}
                 disabled={disabled}
+                data-testid="chat-composer-input"
                 className="min-h-[40px] max-h-[200px] resize-none border-0 focus-visible:ring-0 focus-visible:ring-offset-0 shadow-none bg-transparent py-2.5 px-2 text-[15px] placeholder:text-muted-foreground/60 leading-relaxed"
                 rows={1}
               />
@@ -501,6 +502,7 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false, i
               onClick={sending ? handleStop : handleSend}
               disabled={sending ? !canStop : !canSend}
               size="icon"
+              data-testid="chat-composer-send"
               className={`shrink-0 h-10 w-10 rounded-full transition-colors ${
                 (sending || canSend)
                   ? 'bg-black/5 dark:bg-white/10 text-foreground hover:bg-black/10 dark:hover:bg-white/20'