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-evidence.test.ts

@@ -148,6 +148,134 @@ test('buildVersionDailyEvidence groups version activity and detects no activity/
   assert.ok(evidence.silentRisks?.some((risk) => risk.key === 'no_activity' && risk.itemId === 'plan-1'));
 });
 
+test('buildVersionDailyEvidence uses plan record work start time for daily hours', () => {
+  const workItems = buildXiaobaoWorkItems({
+    plans: [
+      plan({
+        id: 'plan-cross-day',
+        title: 'Product plan',
+        actualStartAt: '2026-06-30T01:00:00.000Z',
+        createdAt: '2026-06-30T01:00:00.000Z',
+      }),
+    ],
+    versions: [{ id: 'ver-1', name: 'V1.0', productName: 'FTB', projectName: 'PM' }],
+    requirementVersionMap: new Map(),
+  });
+  const activities: WorkActivity[] = [
+    {
+      id: 'act-plan-record',
+      actorId: 'pm-1',
+      date: '2026-07-01',
+      occurredAt: '2026-07-01T04:00:00.000Z',
+      sourceType: 'version_plan',
+      sourceId: 'plan-cross-day',
+      action: 'version_plan_requirement_progress',
+      category: 'progress',
+      title: 'Product plan',
+      summary: 'Updated product plan requirement progress',
+      metadata: {
+        requirementId: 'req-1',
+        workStartedAt: '2026-07-01T02:00:00.000Z',
+      },
+    },
+  ];
+
+  const evidence = buildVersionDailyEvidence({
+    versionId: 'ver-1',
+    workItems,
+    activities,
+    worklogs: [],
+    now: new Date('2026-07-01T08:00:00.000Z'),
+  });
+
+  assert.equal(evidence.todayActualHours, 2);
+});
+
+test('buildVersionDailyEvidence uses previous progress next start time for dev task daily hours', () => {
+  const workItems = buildXiaobaoWorkItems({
+    devTasks: [
+      devTask({
+        id: 'dev-cross-day-progress',
+        title: 'Cross-day development',
+        actualStartAt: '2026-07-01T01:30:00.000Z',
+        updatedAt: '2026-07-02T10:00:00.000Z',
+      }),
+    ],
+    versions: [{ id: 'ver-1', name: 'V1.0', productName: 'FTB', projectName: 'PM' }],
+    requirementVersionMap: new Map([['req-1', 'ver-1']]),
+  });
+  const activities: WorkActivity[] = [
+    {
+      id: 'act-dev-progress-day-1',
+      actorId: 'dev-1',
+      date: '2026-07-01',
+      occurredAt: '2026-07-01T10:00:00.000Z',
+      sourceType: 'dev_task',
+      sourceId: 'dev-cross-day-progress',
+      action: 'progress_note_added',
+      category: 'note',
+      title: 'Cross-day development',
+      summary: 'Updated today progress',
+      metadata: {
+        note: 'Finished the first part',
+        nextStartAt: '2026-07-02T01:30:00.000Z',
+      },
+    },
+    {
+      id: 'act-dev-progress-day-2',
+      actorId: 'dev-1',
+      date: '2026-07-02',
+      occurredAt: '2026-07-02T10:00:00.000Z',
+      sourceType: 'dev_task',
+      sourceId: 'dev-cross-day-progress',
+      action: 'progress_note_added',
+      category: 'note',
+      title: 'Cross-day development',
+      summary: 'Updated today progress',
+      metadata: {
+        note: 'Finished the second part',
+        nextStartAt: '2026-07-03T01:30:00.000Z',
+      },
+    },
+  ];
+
+  const evidence = buildVersionDailyEvidence({
+    versionId: 'ver-1',
+    workItems,
+    activities,
+    worklogs: [],
+    now: new Date('2026-07-02T10:00:00.000Z'),
+  });
+
+  assert.equal(evidence.todayActualHours, 7.5);
+});
+
+test('buildVersionDailyEvidence does not emit Infinity-day silent risk details', () => {
+  const workItems = buildXiaobaoWorkItems({
+    plans: [
+      plan({
+        id: 'plan-no-evidence',
+        title: 'Plan without evidence',
+        createdAt: '2026-06-20T01:00:00.000Z',
+        actualStartAt: '2026-06-20T01:00:00.000Z',
+      }),
+    ],
+    versions: [{ id: 'ver-1', name: 'V1.0', productName: 'FTB', projectName: 'PM' }],
+    requirementVersionMap: new Map(),
+  });
+
+  const evidence = buildVersionDailyEvidence({
+    versionId: 'ver-1',
+    workItems,
+    activities: [],
+    worklogs: [],
+    now: new Date('2026-06-29T08:00:00.000Z'),
+  });
+
+  assert.ok((evidence.silentRisks ?? []).length > 0);
+  assert.equal((evidence.silentRisks ?? []).some((risk) => risk.detail.includes('Infinity')), false);
+});
+
 test('buildVersionDailyEvidence mirrors daily report timestamp fallback evidence', () => {
   const workItems = buildXiaobaoWorkItems({
     plans: [