feat(composer): persist text + reply target per chat across restarts

apps/desktop/src/lib/composerDraftStore.test.ts

@@ -0,0 +1,79 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import {
+  __resetForTests,
+  clearDraft,
+  getDraftSync,
+  hasDraft,
+  hydrateDrafts,
+  setDraft,
+} from './composerDraftStore';
+
+const sqlExecuteMock = vi.fn().mockResolvedValue(undefined);
+const sqlSelectMock = vi.fn().mockResolvedValue([]);
+const sqlLoadMock = vi.fn().mockResolvedValue('mock-handle');
+
+vi.stubGlobal('window', {
+  electronAPI: {
+    platform: 'electron-chatapp-v1',
+    sqlLoad: sqlLoadMock,
+    sqlExecute: sqlExecuteMock,
+    sqlSelect: sqlSelectMock,
+  },
+});
+
+describe('composerDraftStore', () => {
+  beforeEach(() => {
+    sqlExecuteMock.mockClear();
+    sqlSelectMock.mockClear();
+    sqlLoadMock.mockClear();
+    __resetForTests();
+  });
+
+  afterEach(() => {
+    __resetForTests();
+  });
+
+  it('returns null for an unknown conversation', () => {
+    expect(getDraftSync('unknown')).toBeNull();
+    expect(hasDraft('unknown')).toBe(false);
+  });
+
+  it('stores and returns a draft synchronously after set', () => {
+    setDraft('a', { text: 'hi', replyToId: null });
+    const draft = getDraftSync('a');
+    expect(draft).not.toBeNull();
+    expect(draft?.text).toBe('hi');
+    expect(draft?.replyToId).toBeNull();
+    expect(hasDraft('a')).toBe(true);
+  });
+
+  it('isolates drafts per conversation', () => {
+    setDraft('a', { text: 'one', replyToId: null });
+    setDraft('b', { text: 'two', replyToId: 'msg-9' });
+    expect(getDraftSync('a')?.text).toBe('one');
+    expect(getDraftSync('b')?.replyToId).toBe('msg-9');
+  });
+
+  it('clearDraft removes the draft from memory', () => {
+    setDraft('a', { text: 'one', replyToId: null });
+    clearDraft('a');
+    expect(getDraftSync('a')).toBeNull();
+    expect(hasDraft('a')).toBe(false);
+  });
+
+  it('treats an empty-string text + null reply as "no draft"', () => {
+    setDraft('a', { text: '', replyToId: null });
+    expect(getDraftSync('a')).toBeNull();
+    expect(hasDraft('a')).toBe(false);
+  });
+
+  it('hydrateDrafts populates the in-memory map from SQLite rows', async () => {
+    sqlSelectMock.mockResolvedValueOnce([
+      { conversation_id: 'a', text: 'persisted', reply_to_id: 'msg-1', updated_at: '2026-05-17T00:00:00Z' },
+    ]);
+    await hydrateDrafts();
+    expect(getDraftSync('a')?.text).toBe('persisted');
+    expect(getDraftSync('a')?.replyToId).toBe('msg-1');
+  });
+});