feat(updater): support updates after verified SeaweedFS migration

frontend/tests/selfhost-updates.test.cjs

@@ -82,6 +82,19 @@ test('recovery, up-to-date, unmanaged compose and other active jobs prevent appl
   }
 })
 
+test('a completed storage migration stays blocked until the host handover is complete', async t => {
+  let state = { ...overview(check, { status: 'failed', recoveryRequired: true }),
+    storage: { provider: 'seaweedfs', migrationPending: true } }
+  const f = await setup(t, async path => path.endsWith('/status') ? state : state.request)
+  assert.equal(f.ui.overview.value.storage.migrationPending, true)
+  assert.equal(f.ui.canApply.value, false)
+  state = { ...overview({ ...check, plan: { ...check.plan, storageProvider: 'seaweedfs', storageImageRetained: true } }),
+    storage: { provider: 'seaweedfs', migrationPending: false } }
+  await f.ui.refresh()
+  assert.equal(f.ui.canApply.value, true)
+  assert.equal(f.ui.job.value.plan.storageProvider, 'seaweedfs')
+})
+
 test('an older polling response cannot erase a new submission whose response was lost', async t => {
   let hold = false, release
   const f = await setup(t, async (path, options) => {