feat: add archived chat recovery menu

frontend/src/app/globals.css

@@ -262,7 +262,9 @@ button:disabled { cursor: default; opacity: .45; }
 .brand-mark, .auth-brand span { width: 32px; height: 32px; border-radius: 50%; background: var(--color-canvas) url("/jyotish-logo.png") center / contain no-repeat; box-shadow: 0 0 0 1px var(--color-border); }
 .auth-story-brand img { width: 32px; height: 32px; border-radius: 50%; object-fit: contain; box-shadow: 0 0 0 1px var(--color-border); }
 .new-chat { width: 100%; min-height: 44px; display: flex; align-items: center; justify-content: center; gap: 8px; padding: 0 14px; border: 0; background: var(--color-surface-dark); color: var(--color-on-dark); cursor: pointer; font-size: var(--type-body-sm); transition: background-color 140ms ease-out, transform 120ms ease-out; margin: var(--space-4) 0 var(--space-6); border-radius: var(--radius-md); font-weight: 500; }
-.sidebar-label { display: block; padding: 0 var(--space-3) var(--space-2); color: var(--color-ink-tertiary); font-size: var(--type-overline); font-weight: 500; letter-spacing: 1.5px; }
+.session-nav-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); padding: 0 var(--space-3) var(--space-2); }
+.sidebar-label { display: block; color: var(--color-ink-tertiary); font-size: var(--type-overline); font-weight: 500; letter-spacing: 1.5px; }
+.session-nav-header button { min-height: 26px; padding: 0 8px; border: 1px solid var(--color-border); border-radius: 999px; background: var(--color-canvas); color: var(--color-ink-secondary); cursor: pointer; font-size: 11px; }
 .session-list { min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: var(--space-1); }
 .session-row { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 30px; align-items: center; border-radius: var(--radius-md); color: var(--color-ink-secondary); }
 .session-row > button:first-child { position: relative; width: 100%; display: grid; gap: 2px; border: 0; background: transparent; cursor: pointer; text-align: left; transition: background-color 120ms ease-out, color 120ms ease-out, transform 120ms ease-out; min-height: 52px; padding: var(--space-2) var(--space-3) var(--space-2) var(--space-4); border-radius: var(--radius-md); color: inherit; }

frontend/src/app/page.tsx

@@ -669,6 +669,7 @@ export default function Home() {
   const [sessions, setSessions] = useState<ChatSession[]>([]);
   const [pinnedSessionIds, setPinnedSessionIds] = useState<string[]>([]);
   const [archivedSessionIds, setArchivedSessionIds] = useState<string[]>([]);
+  const [showArchivedSessions, setShowArchivedSessions] = useState(false);
   const [sessionMenuId, setSessionMenuId] = useState<string | null>(null);
   const [modelCatalog, setModelCatalog] = useState<PublicLanguageModelCatalog | null>(null);
   const [activeSessionId, setActiveSessionId] = useState("");
@@ -714,7 +715,7 @@ export default function Home() {
 
   const activeSession = sessions.find((session) => session.id === activeSessionId) ?? sessions[0];
   const visibleSessions = sessions
-    .filter((session) => !archivedSessionIds.includes(session.id))
+    .filter((session) => showArchivedSessions ? archivedSessionIds.includes(session.id) : !archivedSessionIds.includes(session.id))
     .sort((left, right) => Number(pinnedSessionIds.includes(right.id)) - Number(pinnedSessionIds.includes(left.id)));
   const activeError = requestError && requestError.sessionId === activeSession?.id ? requestError.message : "";
   const isLoading = pendingSessionId === activeSession?.id;
@@ -2004,7 +2005,12 @@ export default function Home() {
         <div className="brand-row"><span className="brand-mark" aria-hidden="true" /><strong>Jyotisha</strong><button className="sidebar-close" ref={sidebarCloseButton} aria-label="关闭聊天记录" type="button" onClick={() => setMobileSidebarOpen(false)}><X aria-hidden="true" /></button></div>
         <button className="new-chat" type="button" onClick={() => void startNewChat()} disabled={!hydrated || !account || !modelCatalog || creatingSession || Boolean(pendingSessionId) || cancellationPending}><Plus aria-hidden="true" /> {creatingSession ? "正在创建" : "新对话"}</button>
         <nav className="session-nav" aria-label="聊天记录">
-          <span className="sidebar-label">聊天记录</span>
+          <div className="session-nav-header">
+            <span className="sidebar-label">{showArchivedSessions ? "归档记录" : "聊天记录"}</span>
+            <button type="button" onClick={() => { setShowArchivedSessions((current) => !current); setSessionMenuId(null); }}>
+              {showArchivedSessions ? "返回" : `归档 ${archivedSessionIds.length}`}
+            </button>
+          </div>
           <div className="session-list">
             {visibleSessions.map((session) => (
               <div
@@ -2036,7 +2042,7 @@ export default function Home() {
                     <button type="button" role="menuitem" onClick={() => { togglePinnedSession(session.id); setSessionMenuId(null); }}>{pinnedSessionIds.includes(session.id) ? "取消置顶" : "置顶"}</button>
                     <button type="button" role="menuitem" onClick={() => { setSessionMenuId(null); void renameSession(session); }}>重命名</button>
                     <button type="button" role="menuitem" onClick={() => { setSessionMenuId(null); void shareSession(session); }}>转发</button>
-                    <button type="button" role="menuitem" onClick={() => { toggleArchivedSession(session.id); setSessionMenuId(null); }}>归档</button>
+                    <button type="button" role="menuitem" onClick={() => { toggleArchivedSession(session.id); setSessionMenuId(null); }}>{archivedSessionIds.includes(session.id) ? "恢复" : "归档"}</button>
                     <button type="button" role="menuitem" onClick={() => { setSessionMenuId(null); void deleteSession(session); }}>删除</button>
                   </div>
                 )}

tests/test_session_management_entrypoints.py

@@ -11,6 +11,7 @@ def test_chat_history_management_actions_are_exposed() -> None:
         "deleteSession",
         "togglePinnedSession",
         "toggleArchivedSession",
+        "showArchivedSessions",
         "shareSession",
         "onContextMenu",
         "session-menu-trigger",
@@ -18,6 +19,7 @@ def test_chat_history_management_actions_are_exposed() -> None:
         "置顶",
         "重命名",
         "归档",
+        "恢复",
         "删除",
         "转发",
     ):