feat: improve session sidebar archive and pagination controls

Add a toggle for displaying archived sessions in the sidebar menu
Load more sessions in smaller increments
Reset expanded session counts when collapsing groups or projects

packages/ui/src/lib/i18n/messages/zh-TW.ts

@@ -313,6 +313,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.header.displayMode.default': '預設',
   'sessions.sidebar.header.displayMode.minimal': '精簡',
   'sessions.sidebar.header.displayMode.showRecent': '顯示最近部分',
+  'sessions.sidebar.header.displayMode.showArchived': '顯示已封存會話',
   'sessions.sidebar.header.displayMode.collapseAll': '全部摺疊',
   'sessions.sidebar.header.displayMode.expandAll': '全部展開',
   'sessions.sidebar.header.search.matchCountSingle': '{count} 個符合',
@@ -455,6 +456,7 @@ export const dict: Record<I18nKey, string> = {
   'sessions.sidebar.group.pr.status.closed': '已關閉',
   'sessions.sidebar.group.empty.noArchivedSessions': '暫無已封存會話。',
   'sessions.sidebar.group.empty.noSessionsInWorkspace': '該工作區暫無會話。',
+  'sessions.sidebar.group.showMore': '顯示更多會話',
   'sessions.sidebar.group.showMoreSingle': '再顯示 {count} 個會話',
   'sessions.sidebar.group.showMorePlural': '再顯示 {count} 個會話',
   'sessions.sidebar.group.showFewer': '顯示更少會話',