fix(小宝预警): 稳定风险证据与建议更新

关键改动：

- 优化风险证据的日报工时与静默风险计算

- 稳定 AI 触发签名，避免证据细节变化造成重复请求

- 调整预警建议更新状态与相关测试

Co-Authored-By: Codex GPT-5 <codex@openai.com>

apps/web/lib/xiaobao-risk-ai.test.ts

@@ -429,6 +429,65 @@ test('getReusableInsight keeps showing cached insight when only refresh-volatile
   );
 });
 
+test('getReusableInsight keeps cached insight when only daily report evidence details change', () => {
+  const cachedRisk = risk({
+    riskLevel: 'at_risk',
+    riskScore: 82,
+    confidence: 70,
+    signals: { ...risk().signals, failedTestCount: 2, silentRiskCount: 1, daysToExpectedRelease: 1 },
+    dailyEvidence: {
+      todayDeliveries: [],
+      todayProgress: [
+        { id: 'ev-old', title: 'Progress', summary: 'Worked on checkout flow.', occurredAt: '2026-06-30T03:00:00.000Z' },
+      ],
+      todayCreations: [],
+      todayRisks: [],
+      progressNotes: [],
+      needsProgressItems: [],
+      recentActivityCount: 2,
+      totalActivityCount: 1,
+      todayActualHours: 1,
+      lastActivityAt: '2026-06-30T03:00:00.000Z',
+    },
+    currentSnapshot: snapshot({ riskScore: 82, failedTestCount: 2, silentRiskCount: 1 }),
+  });
+  const current = risk({
+    riskLevel: 'at_risk',
+    riskScore: 82,
+    confidence: 70,
+    signals: { ...risk().signals, failedTestCount: 2, silentRiskCount: 1, daysToExpectedRelease: 1 },
+    dailyEvidence: {
+      todayDeliveries: [],
+      todayProgress: [
+        { id: 'ev-new', title: 'Progress', summary: 'Updated checkout flow and added handoff notes.', occurredAt: '2026-07-01T04:00:00.000Z' },
+        { id: 'ev-new-2', title: 'Progress', summary: 'Confirmed QA scope.', occurredAt: '2026-07-01T05:00:00.000Z' },
+      ],
+      todayCreations: [],
+      todayRisks: [],
+      progressNotes: [
+        { id: 'note-new', title: 'Note', summary: 'Next work starts tomorrow morning.', occurredAt: '2026-07-01T06:00:00.000Z' },
+      ],
+      needsProgressItems: [],
+      recentActivityCount: 6,
+      totalActivityCount: 3,
+      todayActualHours: 4,
+      lastActivityAt: '2026-07-01T06:00:00.000Z',
+    },
+    currentSnapshot: snapshot({ riskScore: 82, failedTestCount: 2, silentRiskCount: 1 }),
+  });
+  const cached = insight({
+    riskSignature: buildRiskInsightSignature(cachedRisk),
+    insight: { ...insight().insight, summary: 'Cached advice should remain visible.' },
+    generatedAt: '2026-06-30T08:00:00.000Z',
+  });
+
+  assert.equal(getReusableInsight([cached], current)?.insight.summary, 'Cached advice should remain visible.');
+  assert.equal(
+    shouldRequestRiskInsightWithCacheGate(true, [cached], current, snapshot({ riskScore: 70 }), new Date('2026-07-01T09:00:00.000Z')),
+    false,
+  );
+});
+
 test('getReusableInsight does not reuse cached insight when core risk facts change', () => {
   const cachedRisk = risk({
     riskLevel: 'likely_delayed',