diff --git a/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz b/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz
index 2635ee5..a67a814 100644
Binary files a/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz and b/dist-exe/cc-web-bun-linux-x64-baseline.tar.gz differ
diff --git a/public/app.js b/public/app.js
index 563cf9b..e0170c0 100644
--- a/public/app.js
+++ b/public/app.js
@@ -2294,11 +2294,14 @@
 
   function mergeSessionListSnapshot(snapshot) {
     if (!snapshot?.sessionId) return;
+    const hasSnapshotCwd = Object.prototype.hasOwnProperty.call(snapshot, 'cwd');
+    const snapshotCwd = hasSnapshotCwd ? String(snapshot.cwd || '').trim() : '';
+    const snapshotProjectName = String(snapshot.projectName || '').trim();
     const nextMeta = {
       id: snapshot.sessionId,
       sessionId: snapshot.sessionId,
-      cwd: snapshot.cwd || '',
-      projectName: snapshot.cwd ? getPathLeaf(snapshot.cwd) : snapshot.projectName || '',
+      cwd: hasSnapshotCwd ? snapshotCwd : '',
+      projectName: hasSnapshotCwd ? (snapshotCwd ? getPathLeaf(snapshotCwd) : '') : snapshotProjectName,
       title: snapshot.title || '新会话',
       agent: normalizeAgent(snapshot.agent),
       updated: snapshot.updated || new Date().toISOString(),
@@ -2322,8 +2325,12 @@
       return {
         ...session,
         ...nextMeta,
-        cwd: nextMeta.cwd || session.cwd || '',
-        projectName: nextMeta.cwd ? getPathLeaf(nextMeta.cwd) : session.projectName || nextMeta.projectName || '',
+        // 服务端显式传空 cwd 代表项目归属已清除，不能再沿用旧项目名；
+        // 只有完全未提供 cwd 时，才保留缓存中的路径作为兼容降级。
+        cwd: hasSnapshotCwd ? nextMeta.cwd : session.cwd || '',
+        projectName: hasSnapshotCwd
+          ? nextMeta.projectName
+          : nextMeta.projectName || session.projectName || (session.cwd ? getPathLeaf(session.cwd) : ''),
         title: nextMeta.title || session.title,
         titleSource: nextMeta.titleSource || session.titleSource || null,
         createdFromKind: nextMeta.createdFromKind || session.createdFromKind || null,
diff --git a/scripts/regression.js b/scripts/regression.js
index 10cdc6a..562c482 100644
--- a/scripts/regression.js
+++ b/scripts/regression.js
@@ -2609,6 +2609,84 @@ function assertSessionItemTooltipContract() {
   assert(!createItemSource.includes('item.title = sessionCwd'), 'Session card should not fall back to a project-only tooltip');
 }
 
+function assertSessionProjectSnapshotContract() {
+  const frontendSource = fs.readFileSync(PUBLIC_APP_PATH, 'utf8');
+  const mergeSource = extractFunctionSource(frontendSource, 'mergeSessionListSnapshot');
+  const api = new Function(`
+    let sessions = [];
+    function normalizeAgent(agent) {
+      return ['claude', 'codex', 'codexapp'].includes(agent) ? agent : 'claude';
+    }
+    function getPathLeaf(input) {
+      const normalized = String(input || '').replace(/\\\\/g, '/').replace(/\\/+$/, '');
+      return normalized.split('/').filter(Boolean).pop() || '';
+    }
+    function compareSessionUpdatedDesc(a, b) {
+      return new Date(b.updated || 0) - new Date(a.updated || 0);
+    }
+    ${mergeSource}
+    return {
+      mergeSessionListSnapshot,
+      setSessions(next) { sessions = next.map((item) => ({ ...item })); },
+      getSession(id) { return sessions.find((item) => item.id === id) || null; },
+    };
+  `)();
+
+  api.setSessions([{
+    id: 'snapshot-session',
+    agent: 'codexapp',
+    cwd: '/home/hdzx/2026/english',
+    projectName: 'english',
+    title: '输入保护',
+    updated: '2026-08-19T01:25:00.000Z',
+  }]);
+  api.mergeSessionListSnapshot({
+    sessionId: 'snapshot-session',
+    cwd: '',
+    projectName: '',
+    title: '输入保护',
+    updated: '2026-08-19T01:26:00.000Z',
+  });
+  const cleared = api.getSession('snapshot-session');
+  assert(cleared.cwd === '', 'Explicit empty snapshot cwd should clear the stale session cwd');
+  assert(cleared.projectName === '', 'Explicit empty snapshot cwd should clear the stale project name');
+
+  api.setSessions([{
+    id: 'snapshot-session',
+    agent: 'codexapp',
+    cwd: '/home/hdzx',
+    projectName: 'hdzx',
+    title: '输入保护',
+    updated: '2026-08-19T01:25:00.000Z',
+  }]);
+  api.mergeSessionListSnapshot({
+    sessionId: 'snapshot-session',
+    cwd: '/home/hdzx/2026/english',
+    projectName: 'hdzx',
+    title: '输入保护',
+    updated: '2026-08-19T01:27:00.000Z',
+  });
+  const changed = api.getSession('snapshot-session');
+  assert(changed.cwd === '/home/hdzx/2026/english', 'Snapshot cwd changes should replace the previous project cwd');
+  assert(changed.projectName === 'english', 'Snapshot cwd changes should derive the displayed project from the new cwd');
+
+  api.setSessions([{
+    id: 'snapshot-session',
+    agent: 'codexapp',
+    cwd: '/home/hdzx/2026/english',
+    projectName: 'english',
+    title: '输入保护',
+    updated: '2026-08-19T01:25:00.000Z',
+  }]);
+  api.mergeSessionListSnapshot({
+    sessionId: 'snapshot-session',
+    title: '输入保护',
+    updated: '2026-08-19T01:28:00.000Z',
+  });
+  const omitted = api.getSession('snapshot-session');
+  assert(omitted.cwd === '/home/hdzx/2026/english' && omitted.projectName === 'english', 'Snapshots that omit cwd should preserve the cached project metadata');
+}
+
 function assertSidebarTitleRefreshStormContract() {
   const frontendSource = fs.readFileSync(PUBLIC_APP_PATH, 'utf8');
   const createItemSource = extractFunctionSource(frontendSource, 'createSessionListItem');
@@ -5897,6 +5975,11 @@ async function main() {
       console.log('Session item tooltip regression checks passed.');
       return;
     }
+    if (regressionTarget === 'session-project-snapshot') {
+      assertSessionProjectSnapshotContract();
+      console.log('Session project snapshot regression checks passed.');
+      return;
+    }
     if (regressionTarget === 'sidebar-title-refresh-storm') {
       assertSidebarTitleRefreshStormContract();
       assertCcwebMcpChildUpdateCoalescingContract();
@@ -5977,6 +6060,7 @@ async function main() {
   assertFrontendPrimaryCodexAppUiContract();
   assertSetTitleMcpContract();
   assertSessionItemTooltipContract();
+  assertSessionProjectSnapshotContract();
   assertCcwebMcpChildUpdateCoalescingContract();
   assertTitleHistoryOutlineContract();
   assertSessionSwitchResilienceContract();