diff --git a/web/static/js/chat.js b/web/static/js/chat.js
index fe48e3f4..97fc3000 100644
--- a/web/static/js/chat.js
+++ b/web/static/js/chat.js
@@ -2843,10 +2843,12 @@ async function startNewConversation() {
     } catch (e) { /* ignore */ }
     currentConversationGroupId = null; // 新对话不属于任何分组
     if (typeof ensureDefaultActiveProjectForNewChat === 'function') {
-        ensureDefaultActiveProjectForNewChat().catch(() => {});
+        try {
+            await ensureDefaultActiveProjectForNewChat();
+        } catch (e) { /* ignore */ }
     }
     if (typeof refreshChatProjectSelector === 'function') {
-        refreshChatProjectSelector();
+        await refreshChatProjectSelector();
     }
     document.getElementById('chat-messages').innerHTML = '';
     const readyMsgNew = typeof window.t === 'function' ? window.t('chat.systemReadyMessage') : '系统已就绪。请输入您的测试需求，系统将自动执行相应的安全测试。';
diff --git a/web/static/js/projects.js b/web/static/js/projects.js
index 8c1c174a..4174d4f8 100644
--- a/web/static/js/projects.js
+++ b/web/static/js/projects.js
@@ -306,23 +306,9 @@ function prefetchProjectsForChat() {
     ensureProjectsLoaded().catch(() => {});
 }
 
-/** 新对话时：保留有效 activeProjectId，否则默认选中第一个进行中的项目 */
+/** 新对话时默认不绑定项目；用户需主动选择后才写入共享黑板 */
 async function ensureDefaultActiveProjectForNewChat() {
-    try {
-        await ensureProjectsLoaded();
-        const cur = getActiveProjectId();
-        if (cur && isActiveChatProjectId(cur)) return cur;
-        const source = projectsCacheAll.length ? projectsCacheAll : projectsCache;
-        const first =
-            source.find((p) => p.pinned && p.status !== 'archived') ||
-            source.find((p) => p.status !== 'archived');
-        if (first) {
-            setActiveProjectId(first.id);
-            return first.id;
-        }
-    } catch (e) {
-        console.warn(e);
-    }
+    setActiveProjectId('');
     return '';
 }
 
@@ -345,7 +331,9 @@ async function initProjectsPage() {
     const page = document.getElementById('page-projects');
     if (!page || page.style.display === 'none') return;
     initProjectsModalEscape();
-    syncProjectsModalBodyLock();
+    if (typeof syncAppModalBodyLock === 'function') {
+        syncAppModalBodyLock();
+    }
     updateProjectsDetailVisibility();
     projectsListPagination.pageSize = getProjectsListPageSize();
     renderProjectsPagination();
diff --git a/web/static/js/router.js b/web/static/js/router.js
index 2e18373b..ddfeecd3 100644
--- a/web/static/js/router.js
+++ b/web/static/js/router.js
@@ -505,7 +505,7 @@ document.addEventListener('DOMContentLoaded', function() {
         let pageId = hashParts[0];
         
         if (pageId === 'c2') pageId = 'c2-listeners';
-        if (pageId && ['dashboard', 'chat', 'hitl', 'info-collect', 'tasks', 'vulnerabilities', 'webshell', 'chat-files', 'mcp-monitor', 'mcp-management', 'knowledge-management', 'knowledge-retrieval-logs', 'roles-management', 'skills-monitor', 'skills-management', 'agents-management', 'settings', 'c2-listeners', 'c2-sessions', 'c2-tasks', 'c2-payloads', 'c2-events', 'c2-profiles'].includes(pageId)) {
+        if (pageId && ['dashboard', 'chat', 'hitl', 'info-collect', 'projects', 'tasks', 'vulnerabilities', 'webshell', 'chat-files', 'mcp-monitor', 'mcp-management', 'knowledge-management', 'knowledge-retrieval-logs', 'roles-management', 'skills-monitor', 'skills-management', 'agents-management', 'settings', 'c2-listeners', 'c2-sessions', 'c2-tasks', 'c2-payloads', 'c2-events', 'c2-profiles'].includes(pageId)) {
             switchPage(pageId);
             if (pageId === 'chat') {
                 scheduleChatConversationFromHash(200);
diff --git a/web/templates/index.html b/web/templates/index.html
index bb9f6f71..fb7c2862 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -9,6 +9,7 @@
     <link rel="stylesheet" href="/static/css/style.css">
     <link rel="stylesheet" href="/static/css/c2.css">
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/xterm@4.19.0/css/xterm.css">
+    <script src="/static/js/router.js"></script>
 </head>
 <body>
     <div id="login-overlay" class="login-overlay" style="display: none;">
@@ -4293,7 +4294,6 @@
     <script src="/static/js/modal.js"></script>
     <script src="/static/js/notifications.js"></script>
     <script src="/static/js/info-collect.js"></script>
-    <script src="/static/js/router.js"></script>
     <script src="/static/js/agents.js"></script>
     <script src="/static/js/dashboard.js"></script>
     <script src="/static/js/chat-scroll.js"></script>