fix: preserve newer tender note drafts after delayed saves

tests/note-drafts.test.mjs

@@ -0,0 +1,25 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { editNoteDraft, acknowledgeNoteDraft } from '../src/services/noteDrafts.js';
+
+test('late note acknowledgement preserves newer edits and other tender drafts', () => {
+  let state = editNoteDraft({ owner: 'a', drafts: {} }, 'a', 'giresun', 'İlk not');
+  const submitted = state.drafts.giresun;
+  state = editNoteDraft(state, 'a', 'kayseri', 'Başka ihale');
+  const acknowledged = acknowledgeNoteDraft(state, 'a', 'giresun', submitted);
+  assert.equal(acknowledged.drafts.giresun, undefined);
+  assert.equal(acknowledged.drafts.kayseri.text, 'Başka ihale');
+  state = editNoteDraft(state, 'a', 'giresun', 'Yeni not');
+  assert.equal(acknowledgeNoteDraft(state, 'a', 'giresun', submitted), state);
+  state = editNoteDraft(state, 'a', 'giresun', 'İlk not');
+  assert.equal(acknowledgeNoteDraft(state, 'a', 'giresun', submitted), state);
+});
+
+test('old account acknowledgements cannot clear another session draft', () => {
+  const old = editNoteDraft({ owner: 'a', drafts: {} }, 'a', 'giresun', 'not');
+  const other = editNoteDraft({ owner: 'b', drafts: {} }, 'b', 'giresun', 'not');
+  assert.equal(acknowledgeNoteDraft(other, 'a', 'giresun', old.drafts.giresun), other);
+  assert.equal(editNoteDraft(other, 'a', 'giresun', 'late edit'), other);
+  const relogged = editNoteDraft({ owner: 'a', drafts: {} }, 'a', 'giresun', 'not');
+  assert.equal(acknowledgeNoteDraft(relogged, 'a', 'giresun', old.drafts.giresun), relogged);
+});