feat: 清除header的阴影；取消发送按钮的空值disabled检查；新增删除clearSkill，tag的逻辑；

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -90,13 +90,15 @@ export default function ChatPage() {
               "absolute top-0 right-0 left-0 z-30 mx-[20px] grid h-[58px] shrink-0 grid-cols-3 items-center rounded-t-[20px] border-b py-[15px]",
               isNewThread
                 ? "bg-background/0 backdrop-blur-none"
-                : "bg-background/80 shadow-xs backdrop-blur",
+                : "bg-background/80 backdrop-blur",
             )}
           >
             {/* 返回查看结果左箭头 */}
             <div className="flex h-full w-full items-center text-sm font-medium">
-              <button
-                className="bg-transparent"
+              <Button
+                size="sm"
+                variant="ghost"
+                className="h-full px-[10px] py-[5px] text-sm font-medium"
                 onClick={() => setShowExitDialog(true)}
               >
                 <svg
@@ -114,7 +116,7 @@ export default function ChatPage() {
                     strokeLinejoin="round"
                   />
                 </svg>
-              </button>
+              </Button>
             </div>
             <div className="flex h-full w-full items-center justify-center overflow-hidden text-sm font-medium">
               <ThreadTitle threadId={threadId} thread={thread} />

frontend/src/components/ai-elements/prompt-input.tsx

@@ -1077,18 +1077,23 @@ export const PromptInputSubmit = ({
     : false;
 
   // 正在 streaming 时不允许发送
-  const isStreaming = status === "streaming" || status === "submitted";
+  // const isStreaming = status === "streaming" || status === "submitted";
 
-  const isDisabled = disabled || !hasContent || isStreaming;
+  // const isDisabled = disabled || !hasContent || isStreaming;
 
   let Icon = <ArrowUpIcon className="size-4" />;
 
+  let text: string = "发送";
+
   if (status === "submitted") {
     Icon = <Loader2Icon className="size-4 animate-spin" />;
+    text = "生成中...";
   } else if (status === "streaming") {
     Icon = <SquareIcon className="size-4" />;
+    text = "停止";
   } else if (status === "error") {
     Icon = <XIcon className="size-4" />;
+    text = "错误";
   }
 
   return (
@@ -1097,19 +1102,19 @@ export const PromptInputSubmit = ({
       // 被button{bgc:#fff}覆盖了，只能加"!"
       className={cn(
         "h-[40px] w-[140px] rounded-[10px] border-0 font-bold transition-all",
-        isDisabled
-          ? "cursor-not-allowed !bg-gray-200 text-gray-400"
-          : "!bg-[#F0E8FB] text-[#8E47F0] hover:!bg-[#8E47F0] hover:text-[#FFFFFF]",
+        // isDisabled
+        //   ? "cursor-not-allowed !bg-gray-200 text-gray-400":
+        "!bg-[#F0E8FB] text-[#8E47F0] hover:!bg-[#8E47F0] hover:text-[#FFFFFF]",
         className,
       )}
       size={size}
       type="submit"
       variant={variant}
-      disabled={isDisabled}
+      // disabled={isDisabled}
       {...props}
     >
-      {children ?? Icon}
-      发送
+      {/* {children ?? Icon} */}
+      {text}
     </InputGroupButton>
   );
 };

frontend/src/components/workspace/input-box.tsx

@@ -826,7 +826,7 @@ export function InputBox({
           variant="outline"
           status={status}
         />
-        {/* TODO: 神秘空div */}
+        {/* MARK: 神秘空div */}
         {/* {!isNewThread && (
           <div className="bg-background absolute right-0 -bottom-[17px] left-0 z-0 h-4"></div>
         )} */}

frontend/src/core/i18n/locales/en-US.ts

@@ -24,6 +24,8 @@ export const enUS: Translations = {
     delete: "Delete",
     rename: "Rename",
     share: "Share",
+    fullScreen: "fullScreen",
+    closeFullScreen: "closeFullScreen",
     openInNewWindow: "Open in new window",
     close: "Close",
     more: "More",

frontend/src/hooks/use-iframe-skill.ts

@@ -60,9 +60,13 @@ export function useIframeSkill(): UseIframeSkillReturn {
     window.parent.postMessage(message, "*");
   }, []);
 
-  // 清除选中
+  // 清除选中并发送 skill_id=0 给主页
   const clearSkill = useCallback(() => {
     setSelectedSkill(null);
+    // 发送 skill_id=0 给主页，通知取消选择
+    const message = { type: MESSAGE_TYPES.SELECT_SKILL, skill_id: "0" };
+    console.log("[useIframeSkill] clearSkill, sending skill_id=0:", message);
+    window.parent.postMessage(message, "*");
   }, []);
 
   return { selectedSkill, sendSelectSkill, openSkillDialog, clearSkill };