refactor(platform): 统一控件 - 统一输入按钮与图标控件样式表现

web/src/components/canvas/canvas-cloud-agent-chat-ui.tsx

@@ -1051,6 +1051,7 @@ export function AgentChatComposer({
                             whileTap={canSubmit && !reducedMotion ? { scale: 0.9, y: 1 } : undefined}
                             animate={stopping && !reducedMotion ? { scale: [1, 0.94, 1] } : { scale: 1, rotate: 0 }}
                             transition={sending && !reducedMotion ? { duration: 0.42, ease: "easeOut" } : { type: "spring", stiffness: 420, damping: 24 }}
+                            data-icon-only
                             className="agent-composer-send grid size-7 shrink-0 place-items-center rounded-full p-0 outline-none transition-[background-color,box-shadow,color,transform] duration-200 focus-visible:ring-2 focus-visible:ring-current/35 disabled:cursor-not-allowed"
                             style={{
                                 background: canSubmit || sending ? theme.accent.primary : theme.spatial.surface,