feat: prepare Zhinian desktop client for pilot release

tests/unit/chat-optimistic-match.test.ts

@@ -55,6 +55,28 @@ describe('matchesOptimisticUserMessage', () => {
     expect(matchesOptimisticUserMessage(candidate, optimistic, 1_700_000_000_000)).toBe(true);
   });
 
+  it('matches a same-text Gateway echo whose timestamp drifts during processing', () => {
+    const optimistic = { role: 'user', content: '帮我整理今日事项', timestamp: 1_700_000_000 } as const;
+    const candidate = {
+      role: 'user',
+      content: '[Wed 2026-04-22 10:31 GMT+8] 帮我整理今日事项',
+      timestamp: 1_700_000_045,
+    } as const;
+
+    expect(matchesOptimisticUserMessage(candidate, optimistic, 1_700_000_000_000)).toBe(true);
+  });
+
+  it('does not match an older repeated question from the same session', () => {
+    const optimistic = { role: 'user', content: '继续', timestamp: 1_700_000_000 } as const;
+    const candidate = {
+      role: 'user',
+      content: '继续',
+      timestamp: 1_699_999_700,
+    } as const;
+
+    expect(matchesOptimisticUserMessage(candidate, optimistic, 1_700_000_000_000)).toBe(false);
+  });
+
   it('still rejects unrelated user messages', () => {
     const optimistic = { role: 'user', content: 'run github1', timestamp: 1_700_000_000 } as const;
     const candidate = {