fix(web): preserve saved writes across refresh failures

apps/web_v1/scripts/mutation-refresh.test.mjs

@@ -0,0 +1,41 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { executeSavedMutation } from '../src/app/mutation-refresh.ts'
+
+test('a saved mutation stays successful when its refresh fails', async () => {
+  const events = []
+  const refreshFailure = new Error('refresh unavailable')
+
+  const outcome = await executeSavedMutation({
+    mutate: async () => {
+      events.push('mutate')
+      return { id: 'created-1' }
+    },
+    onSaved: (value) => events.push(`saved:${value.id}`),
+    refresh: async (value) => {
+      events.push(`refresh:${value.id}`)
+      throw refreshFailure
+    },
+  })
+
+  assert.deepEqual(events, ['mutate', 'saved:created-1', 'refresh:created-1'])
+  assert.equal(outcome.value.id, 'created-1')
+  assert.equal(outcome.refreshError, refreshFailure)
+})
+
+test('a failed mutation does not close its draft or attempt a refresh', async () => {
+  const events = []
+  const mutationFailure = new Error('save rejected')
+
+  await assert.rejects(() => executeSavedMutation({
+    mutate: async () => {
+      events.push('mutate')
+      throw mutationFailure
+    },
+    onSaved: () => events.push('saved'),
+    refresh: async () => events.push('refresh'),
+  }), mutationFailure)
+
+  assert.deepEqual(events, ['mutate'])
+})