diff --git a/src/App.tsx b/src/App.tsx
index 48b7a77..b0381ab 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -51,6 +51,7 @@ export function App() {
   const toast = useStore(s => s.toast)
   const trackerRunId = useStore(s => s.ui.trackerRunId)
   const viewingArtifact = useStore(s => s.ui.viewingArtifact)
+  const pendingBadge = useStore(s => s.cards.filter(c => c.status === 'action_required').length)
   // authState：checking → ok（放行）| required（登录门）。
   const [authState, setAuthState] = useState<'checking' | 'required' | 'ok'>('checking')
 
@@ -140,7 +141,9 @@ export function App() {
       ) : (
         <div className="right-panel collapsed" style={{ width: 44 }}>
           <div className="icon-only">
-            <button title="展开工作台" onClick={store.toggleRight}>◧</button>
+            <button title="展开收件箱" onClick={store.toggleRight}>◧
+              {pendingBadge > 0 && <span className="rail-badge" data-testid="rail-badge">{pendingBadge}</span>}
+            </button>
           </div>
         </div>
       )}
diff --git a/src/components/Workbench.tsx b/src/components/Workbench.tsx
index 8532c3e..10257f1 100644
--- a/src/components/Workbench.tsx
+++ b/src/components/Workbench.tsx
@@ -23,6 +23,7 @@ export function Workbench() {
     <>
       <div className="tabs">
         <span className="tab active">收件箱{pending > 0 ? ` ${pending}` : ''}</span>
+        <button className="tab tab-action" title="收纳已完成卡（done→关闭；已确认卡留痕不动）" onClick={() => store.tidyCards()}>🧹 收纳</button>
         <button className="tab" title="收起收件箱" onClick={store.toggleRight}>»</button>
       </div>
       <div className="tab-body">
diff --git a/src/store.ts b/src/store.ts
index 9e16cd1..24422e7 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -418,6 +418,14 @@ export const store = {
   toggleLeft() { setUI({ leftCollapsed: !state.ui.leftCollapsed }) },
   toggleRight() { setUI({ rightCollapsed: !state.ui.rightCollapsed }) },
   openWorkspace(id: string) { setUI({ activeWorkspace: id }) },
+  /** 收纳策略（T5）：一键收纳已完成卡（done→dismissed；resolved 盖章留痕不动）。 */
+  async tidyCards() {
+    const done = state.cards.filter(c => c.status === 'done')
+    for (const c of done) {
+      try { const out = await api.cardDismiss(c.id); store.upsertCard(out.card) } catch { /* 单卡失败不阻断 */ }
+    }
+    if (done.length > 0) store.toast(`已收纳 ${done.length} 张完成卡`)
+  },
   closeWorkspace() { setUI({ activeWorkspace: null }) },
   openInbox(cardId?: string) {
     setUI({ rightCollapsed: false, rightTab: 'inbox' })
diff --git a/src/styles.css b/src/styles.css
index 4d43a27..517b4aa 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -196,3 +196,8 @@ button { font-family: inherit; }
 .project-badge{font-size:11px;padding:1px 8px;border-radius:8px;background:rgba(120,160,255,.15);color:var(--accent);white-space:nowrap}
 .tab-hint{font-size:10px;color:var(--text-faint);align-self:center}
 .empty-note{color:var(--text-faint);font-size:12px;padding:12px 4px}
+
+/* 收纳策略（T5）：收起态角标 + 收纳按钮 */
+.rail-badge{position:absolute;top:-4px;right:-6px;font-size:10px;background:var(--warn,#d29922);color:#fff;border-radius:8px;padding:0 5px;min-width:14px}
+.right-panel.collapsed .icon-only button{position:relative}
+.tab-action{font-size:11px;color:var(--text-faint)}