feat: add session switcher dropdown in header

Open recent sessions from chat headers
Support session switching in mini chat
Share pinned and active session state

packages/ui/src/lib/i18n/messages/en.ts

@@ -214,6 +214,9 @@ export const dict = {
   'sessions.sidebar.empty.noMatches.title': 'No matching sessions',
   'sessions.sidebar.empty.noMatches.description': 'Try a different title, branch, folder, or path.',
   'sessions.sidebar.activity.recentTitle': 'recent',
+  'sessions.switcher.openAria': 'Open session switcher',
+  'sessions.switcher.empty': 'No recent sessions',
+  'sessions.switcher.draftTitle': 'New session',
   'sessions.sidebar.updateCheck.errorTitle': 'Failed to check for updates',
   'sessions.sidebar.updateCheck.latestVersion': 'You are on the latest version',
   'sessions.sidebar.directory.errorAddProjectTitle': 'Failed to add project',