fix(desktop): unarchive from Settings into the session's own sidebar slice

The Settings unarchive prepended the row into $sessions regardless of
source, so a messaging or cron session showed under SESSIONS until the
next refresh. Route it through restoreListedSession, which picks the slice
from the row's source.

apps/desktop/src/app/settings/sessions-settings.test.tsx

@@ -0,0 +1,60 @@
+// @vitest-environment jsdom
+import { act, cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+import { listAllProfileSessions, setSessionArchived } from '@/hermes'
+import { en } from '@/i18n/en'
+import { $messagingSessions, $sessions, setMessagingSessions, setSessions } from '@/store/session'
+import type { SessionInfo } from '@/types/hermes'
+
+import { SessionsSettings } from './sessions-settings'
+
+vi.mock('@/i18n', () => ({ useI18n: () => ({ t: en }) }))
+
+vi.mock('@/hermes', async importOriginal => ({
+  ...(await importOriginal<Record<string, unknown>>()),
+  getHermesConfigRecord: vi.fn().mockResolvedValue({ config: {} }),
+  listAllProfileSessions: vi.fn(),
+  setSessionArchived: vi.fn().mockResolvedValue(undefined)
+}))
+
+const archivedMatrixSession = {
+  archived: true,
+  ended_at: null,
+  id: 'matrix-1',
+  input_tokens: 0,
+  is_active: false,
+  last_active: 1,
+  message_count: 2,
+  model: null,
+  output_tokens: 0,
+  preview: null,
+  source: 'matrix',
+  started_at: 1,
+  title: 'archived room',
+  tool_call_count: 0
+} as SessionInfo
+
+beforeEach(() => {
+  setSessions([])
+  setMessagingSessions([])
+  vi.mocked(listAllProfileSessions).mockResolvedValue({ sessions: [archivedMatrixSession], total: 1 } as never)
+})
+
+afterEach(() => {
+  cleanup()
+})
+
+describe('SessionsSettings unarchive', () => {
+  it('restores a messaging-source session into $messagingSessions, not $sessions', async () => {
+    render(<SessionsSettings />)
+    const button = await screen.findByRole('button', { name: en.settings.sessions.unarchive })
+
+    await act(async () => fireEvent.click(button))
+
+    await waitFor(() => expect(setSessionArchived).toHaveBeenCalledWith('matrix-1', false, undefined))
+    expect($messagingSessions.get().map(session => session.id)).toEqual(['matrix-1'])
+    expect($messagingSessions.get()[0]?.archived).toBe(false)
+    expect($sessions.get()).toEqual([])
+  })
+})

apps/desktop/src/app/settings/sessions-settings.tsx

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useState } from 'react'
 
+import { restoreListedSession } from '@/app/session/hooks/use-session-actions/utils'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Tip } from '@/components/ui/tooltip'
@@ -17,7 +18,7 @@ import { triggerHaptic } from '@/lib/haptics'
 import { Archive, ArchiveOff, FolderOpen, Loader2, Trash2 } from '@/lib/icons'
 import { confirm } from '@/store/confirm'
 import { notify, notifyError } from '@/store/notifications'
-import { applyConfiguredDefaultProjectDir, ensureDefaultWorkspaceCwd, setSessions } from '@/store/session'
+import { applyConfiguredDefaultProjectDir, ensureDefaultWorkspaceCwd } from '@/store/session'
 import { untombstoneSessions } from '@/store/session-removal'
 import { forgetSessionUnread } from '@/store/session-unread'
 import type { HermesConfigRecord, SessionInfo } from '@/types/hermes'
@@ -63,7 +64,7 @@ export function SessionsSettings() {
         // Surface it again in the sidebar without waiting for a full refresh, and
         // lift any optimistic eviction so the grouped tree shows it again too.
         untombstoneSessions([session.id, session._lineage_root_id])
-        setSessions(prev => [{ ...session, archived: false }, ...prev.filter(s => s.id !== session.id)])
+        restoreListedSession({ ...session, archived: false })
         triggerHaptic('selection')
         notify({ durationMs: 2_000, kind: 'success', message: s.restored })
       } catch (err) {