feat: add creative welcome and external works square links

src/components/community/CommunityInvitation.tsx

@@ -0,0 +1,8 @@
+import { CommunityLink } from './CommunityLink';
+
+export function CommunityInvitation() {
+  return <section className="community-invitation" aria-label="作品广场入口" data-testid="community-invitation">
+    <div><h2>还没想到？去找找灵感吧</h2><p>作品广场里，有小伙伴们用麦洛做出的奇思妙想。</p></div>
+    <CommunityLink />
+  </section>;
+}

src/components/community/CommunityLink.tsx

@@ -0,0 +1,24 @@
+import { useState } from 'react';
+import { ArrowUpRight, Compass } from 'lucide-react';
+import { openCommunity } from '@/lib/community';
+import './community.css';
+
+export function CommunityLink({ variant = 'inline', collapsed = false }: {
+  variant?: 'inline' | 'sidebar'; collapsed?: boolean;
+}) {
+  const [opening, setOpening] = useState(false);
+  const [error, setError] = useState(false);
+  return <div>
+    <button type="button" className="community-link" data-variant={variant} data-collapsed={collapsed}
+      aria-label={variant === 'sidebar' ? '作品广场' : '去作品广场逛逛'}
+      title="在浏览器打开作品广场" disabled={opening}
+      onClick={() => {
+        setOpening(true); setError(false);
+        void openCommunity().catch(() => setError(true)).finally(() => setOpening(false));
+      }}>
+      <Compass aria-hidden="true" />
+      {!collapsed && <><span>{variant === 'sidebar' ? '作品广场' : '去作品广场逛逛'}</span><ArrowUpRight className="community-link-arrow" aria-hidden="true" /></>}
+    </button>
+    {error && <span className="community-link-error" role="alert">没能打开作品广场，请再点一次试试。</span>}
+  </div>;
+}

src/components/community/community.css

@@ -0,0 +1,36 @@
+.coding-chat-body { display: flex; flex: 1; flex-direction: column; min-height: 0; min-width: 0; overflow: hidden; }
+.coding-chat-body[hidden] { display: none; }
+.coding-chat-body[data-welcome="true"] { overflow-y: auto; padding: clamp(24px, 4vh, 48px) 24px 28px; background: radial-gradient(ellipse at 45% 18%, #fff8e8 0%, #fffdf8 28%, #fff 67%); }
+.coding-chat-body[data-welcome="true"] .classroom-chat-view { flex: 0 0 auto; }
+.coding-chat-body[data-welcome="true"] .classroom-composer-view { width: 100%; max-width: 740px; margin: 0 auto; }
+.coding-chat-body[data-welcome="true"] [data-testid="coding-message-composer"] { width: 100%; padding: 0 0 28px; }
+.coding-chat-body[data-welcome="true"] .chat-composer-surface { background: #fff; border-color: #d7dfda; border-radius: 20px; box-shadow: 0 5px 0 #eaf0e8, 0 12px 32px #69774b08; }
+.coding-start-heading { position: relative; width: 100%; max-width: 740px; margin: 0 auto; padding: 0 12px 24px; text-align: center; }
+.coding-start-mark { display: inline-grid; position: relative; place-items: center; width: 57px; height: 59px; border-radius: 18px; border: 1px solid #f2d6a7; background: #fff0d7; box-shadow: 0 4px 0 #eeddbd; transform: rotate(-7deg); animation: community-hello 650ms ease-out both; }
+.coding-start-mark img { width: 35px; height: 35px; }
+.coding-start-mark > svg { position: absolute; width: 17px; height: 17px; right: -24px; top: -2px; color: #c78b36; }
+.coding-start-mark > svg:last-child { width: 12px; height: 12px; left: -23px; top: 39px; color: #83a496; }
+.coding-start-eyebrow { margin: 18px 0 7px; color: #7a7769; font-size: 12px; letter-spacing: .08em; }
+.coding-start-heading h1 { color: #304968; font-size: clamp(24px, 2.5vw, 34px); line-height: 1.45; font-weight: 650; letter-spacing: -.04em; }
+.coding-start-heading h1 span { position: relative; white-space: nowrap; background: linear-gradient(transparent 73%, #ffe6a6 73%, #ffe6a6 94%, transparent 94%); }
+.coding-start-caption { margin-top: 10px; color: #718096; font-size: 13px; line-height: 1.8; }
+.community-invitation { display: flex; align-items: center; justify-content: space-between; gap: 18px; width: 100%; max-width: 740px; margin: 5px auto 0; padding: 21px 23px; border: 1px dashed #e4d9bc; border-radius: 18px; background: #fffaf0; color: #304968; }
+.community-invitation h2 { margin-bottom: 5px; font-size: 15px; font-weight: 600; }
+.community-invitation p { color: #7c806e; font-size: 12px; line-height: 1.7; }
+.community-link { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 40px; padding: 8px 13px; border: 1px solid #dce5d0; border-radius: 12px; background: #f0f5e8; color: #526b46; font-size: 13px; cursor: pointer; white-space: nowrap; }
+.community-link:hover:not(:disabled) { background: #e5eed9; border-color: #b7c6a4; }
+.community-link:disabled { opacity: .6; cursor: wait; }
+.community-link:focus-visible { outline: 2px solid #547ab0; outline-offset: 3px; }
+.community-link svg { width: 17px; height: 17px; flex-shrink: 0; }
+.community-link .community-link-arrow { width: 14px; height: 14px; }
+.community-link[data-variant="sidebar"] { justify-content: flex-start; width: 100%; margin-top: 12px; border-color: transparent; background: transparent; text-align: left; }
+.community-link[data-variant="sidebar"]:hover { background: #e8f0e7; }
+.community-link[data-collapsed="true"] { justify-content: center; padding-inline: 0; }
+.community-link-error { display: block; margin-top: 6px; color: #965a45; font-size: 12px; line-height: 1.6; }
+@keyframes community-hello { 0% { transform: rotate(-15deg) translateY(5px); opacity: 0; } 70% { transform: rotate(3deg); opacity: 1; } 100% { transform: rotate(-7deg); } }
+@media (max-width: 600px) {
+  .coding-chat-body[data-welcome="true"] { padding: 24px 16px; }
+  .coding-start-caption { max-width: 230px; margin: 9px auto 0; }
+  .community-invitation { flex-direction: column; align-items: flex-start; gap: 13px; padding: 19px; }
+}
+@media (prefers-reduced-motion: reduce) { .coding-start-mark { animation: none; } }

src/components/layout/Sidebar.tsx

@@ -53,6 +53,7 @@ import { useProviderStore } from '@/stores/providers';
 import type { CodingProjectSummary } from '@/types/coding-project';
 import { useProjectConfigStore } from '@/stores/project-config';
 import { toast } from 'sonner';
+import { CommunityLink } from '@/components/community/CommunityLink';
 
 type OpenDialogResult = {
   canceled: boolean;
@@ -435,6 +436,7 @@ export function Sidebar({
           <Plus className="h-4 w-4 shrink-0 text-brand" />
           {!sidebarCollapsed && '新建项目'}
         </button>
+        <CommunityLink variant="sidebar" collapsed={sidebarCollapsed} />
         <div className="classroom-projects mt-3">
           <button
             type="button"

src/lib/community.ts

@@ -0,0 +1,8 @@
+import { invokeIpc } from './api-client';
+
+export const COMMUNITY_URL = 'https://square.nianxx.cn/#explore';
+
+/** Open only after the student explicitly clicks; no community data is fetched. */
+export async function openCommunity(): Promise<void> {
+  await invokeIpc('shell:openExternal', COMMUNITY_URL);
+}

src/pages/Chat/CodingChatBody.tsx

@@ -0,0 +1,29 @@
+import { useLayoutEffect, useRef, type ReactNode } from 'react';
+
+/** Keep the same composer mounted while the empty state becomes a conversation. */
+export function CodingChatBody({ welcome, hidden, bubble, children }: {
+  welcome: boolean; hidden: boolean; bubble?: HTMLElement | null; children: ReactNode;
+}) {
+  const ref = useRef<HTMLDivElement>(null);
+  useLayoutEffect(() => {
+    const body = ref.current;
+    if (!body || !welcome || hidden || !bubble) return;
+    const update = () => {
+      const area = body.getBoundingClientRect();
+      const message = bubble.getBoundingClientRect();
+      const overlaps = message.height > 0 && message.right > area.left && message.left < area.right && message.bottom > area.top;
+      // Wide workspaces put the welcome beside the teachers. Compact ones flow below them.
+      body.style.paddingRight = overlaps && area.width >= 1050 ? `${Math.ceil(area.right - message.left + 24)}px` : '';
+      body.style.paddingTop = overlaps && area.width < 1050 ? `${Math.ceil(message.bottom - area.top + 24)}px` : '';
+    };
+    update();
+    const observer = typeof ResizeObserver === 'undefined' ? null : new ResizeObserver(update);
+    observer?.observe(body); observer?.observe(bubble);
+    window.addEventListener('resize', update);
+    return () => {
+      observer?.disconnect(); window.removeEventListener('resize', update);
+      body.style.paddingRight = ''; body.style.paddingTop = '';
+    };
+  }, [welcome, hidden, bubble]);
+  return <div ref={ref} className="coding-chat-body" data-welcome={welcome} hidden={hidden}>{children}</div>;
+}

src/pages/Chat/CodingChatPanel.tsx

@@ -47,6 +47,9 @@ import { CodingConversationHeader } from './CodingConversationHeader';
 import { CodingConversationTimeline } from './CodingConversationTimeline';
 import { CodingInteractionPanel } from './CodingInteractionPanel';
 import { CodingWelcomeHero } from './CodingWelcomeHero';
+import { CodingStartHeading } from './CodingStartHeading';
+import { CodingChatBody } from './CodingChatBody';
+import { CommunityInvitation } from '@/components/community/CommunityInvitation';
 import { createLocalConversationSnapshot } from './coding-chat-snapshot';
 import { useAuthStore } from '@/stores/auth';
 import { TeacherChatPanel } from './TeacherChatPanel';
@@ -676,6 +679,8 @@ export function CodingChatPanel({
     });
   }, [loginRecovery, activeProject, targetConversationId, entryLoadState, workspaceLoadState, handleRecovery, draftKey, onLoginRecoveryConsumed]);
   const autoCreating = Boolean(selectedAgent && creatingAgentIds[selectedAgent.id]);
+  const showWelcome = editable && !selectedConversation?.archivedAt && !running && runStatus === 'idle'
+    && (!targetConversationId || (entryLoadState === 'live' && snapshot?.nodes.length === 0));
 
   if (!activeProject && workspaceLoadState !== 'loading') {
     return (
@@ -807,6 +812,7 @@ export function CodingChatPanel({
               }
             }} />
         </div>
+        <CodingChatBody welcome={showWelcome} hidden={agentBrowserOpen} bubble={teacherBubble}>
         <div id="classroom-chat-view" role="tabpanel" aria-labelledby="classroom-chat-tab" hidden={agentBrowserOpen} className="classroom-chat-view min-h-0 flex-1 flex-col">
 
         {(workspaceError || conversationMetadataError || connectionError) && (
@@ -829,7 +835,7 @@ export function CodingChatPanel({
           </div>
         )}
 
-        {targetConversationId
+        {showWelcome ? <CodingStartHeading /> : targetConversationId
           ? (
             <CodingConversationTimeline
               key={targetConversationId}
@@ -959,6 +965,8 @@ export function CodingChatPanel({
           }}
         />}
         </div>
+        {showWelcome && <CommunityInvitation />}
+        </CodingChatBody>
       </div>
 
       {consultationOpen && activeProject && (

src/pages/Chat/CodingStartHeading.tsx

@@ -0,0 +1,11 @@
+import { Sparkles, Star } from 'lucide-react';
+import mark from '@/assets/consultations/mark.svg';
+
+export function CodingStartHeading() {
+  return <div className="coding-start-heading" data-testid="coding-start-heading">
+    <span className="coding-start-mark"><img src={mark} alt="麦洛" /><Sparkles aria-hidden="true" /><Star aria-hidden="true" /></span>
+    <p className="coding-start-eyebrow">小点子，也能变成大惊喜</p>
+    <h1>今天，你想<span>创造什么？</span></h1>
+    <p className="coding-start-caption">一个游戏、一段故事，或是一个天马行空的想法。</p>
+  </div>;
+}

src/pages/Chat/TeacherChatPanel.tsx

@@ -471,7 +471,7 @@ export function TeacherChatPanel({
     (request) => request.status === 'preparing' || request.status === 'running'
   );
   const helpUnavailable = busy || !topicEnabled || Boolean(running);
-  const askForSuggestions = () => void send({ text: '不知道问什么，你先帮我看看👀', intent: 'suggestions' });
+  const askForSuggestions = () => void send({ text: '帮我整体看🧠', intent: 'suggestions' });
   const changeText = (next: string) => { setText(next); persistDraft(next, references, pending.current); };
   const removeReferences = () => { setReferences([]); persistDraft(text, [], pending.current); };
   const questions = definition?.suggested_questions ?? [];
@@ -541,7 +541,7 @@ export function TeacherChatPanel({
                   {request.suggestedQuestions?.map((question, index) => <button key={`${request.id}:${index}`} type="button" disabled={helpUnavailable} onClick={() => void send({ text: question })} className="consultation-follow-up"><span className="min-w-0 flex-1">{question}</span><ChevronRight className="h-4 w-4 shrink-0 opacity-70" aria-hidden="true" /></button>)}
                 </div>
               </>}
-            {['failed', 'cancelled', 'interrupted'].includes(request.status) && <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-retry"><span>不知道问什么，<span className="whitespace-nowrap">你先帮我看看👀</span></span></button>}
+            {['failed', 'cancelled', 'interrupted'].includes(request.status) && <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-retry">帮我整体看🧠</button>}
           </> : request.response ? <TeacherReply text={request.response} /> : <div className="text-[13px] leading-7">{['running', 'preparing'].includes(request.status) ? <span role="status" className="inline-flex items-center gap-2 text-muted-foreground"><Loader2 className="h-3.5 w-3.5 animate-spin motion-reduce:animate-none" />{label}正在想…</span> : ['cancelled', 'interrupted'].includes(request.status) ? '这次先停在这里。想继续时可以再说说。' : ''}</div>}
           {request.intent !== 'suggestions' && request.status === 'completed' && !request.replyIncomplete && Boolean(request.suggestedQuestions?.length) && <div className="consultation-follow-ups" aria-label="接着聊">
             {request.suggestedQuestions?.map((question, index) => <button type="button" key={`${request.id}:${index}`} disabled={helpUnavailable} onClick={() => void send({ text: question })} className="consultation-follow-up"><span className="min-w-0 flex-1">{question}</span><ChevronRight className="h-4 w-4 shrink-0 opacity-70" aria-hidden="true" /></button>)}
@@ -585,7 +585,7 @@ export function TeacherChatPanel({
             className="min-h-[60px] w-full resize-none border-0 bg-transparent text-[13px] leading-6 outline-none placeholder:text-muted-foreground/65" />
           <div className="mt-2 flex min-h-[68px] items-center justify-between gap-2" data-testid="consultation-composer-actions">
             <div className="min-w-0 flex-1">
-              {!draftRevision && !text.trim() && <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-hint"><span>不知道问什么，<span className="whitespace-nowrap">你先帮我看看👀</span></span></button>}
+              {!draftRevision && !text.trim() && <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-hint">帮我整体看🧠</button>}
             </div>
             {running ? <button type="button" className="rounded-lg border px-3 py-2 text-xs" onClick={() => void teacherApi.cancel(topicBase, endpointId, running.id).then(consume).catch(() => setError('暂时无法停止，请稍后重试。'))}>停止回复</button>
             : <button type="submit" aria-label="提问" title={busy ? '正在发送…' : '发送'} disabled={busy || !topicEnabled || !text.trim()} className="consultation-send flex h-8 w-8 items-center justify-center rounded-full text-white disabled:opacity-30"><ArrowUp className="h-4 w-4" /></button>}