feat(web): AI 工作台多 task 串行推进与会话适配

- useWorkbenchAiApplicationPreviewFlow/useWorkbenchAiActionRouter/useWorkbenchAiCommandIntents 支持 task1 完成后自动推进 task2，确认按钮直接拉起申请预览，草稿/提交成功后继续推进下一 task
- workbenchAiIntentPlannerModel/workbenchAiMessageModel/workbenchAiCommandIntentModel 适配多 task 意图规划与消息结构
- aiApplicationPreviewActions/aiApplicationPrecheckModel/aiExpenseDraftModel/aiWorkbenchConversationStore 草稿与会话存储适配
- PersonalWorkbenchAiMode 与样式适配，更新 preview-actions/expense-draft/conversation-store/fast-preview/action-router/command-intent/intent-planner 测试

web/tests/workbench-ai-command-intent-model.test.mjs

@@ -4,8 +4,10 @@ import test from 'node:test'
 import { fileURLToPath } from 'node:url'
 
 import {
+  buildWorkbenchDocumentCommandFollowupGuidance,
   buildWorkbenchDraftDeletionGuidance,
   isWorkbenchDraftDeletionIntent,
+  resolveLatestWorkbenchDocumentCommandContext,
   resolveLatestWorkbenchDraftPayload
 } from '../src/composables/workbenchAiMode/workbenchAiCommandIntentModel.js'
 
@@ -87,8 +89,45 @@ test('workbench draft deletion guidance opens detail instead of deleting directl
   assert.equal(guidance.suggestedActions[0].payload.claim_no, 'ALATEST1')
 })
 
+test('workbench command intent reuses previous approval candidates for follow-up approval command', () => {
+  const context = resolveLatestWorkbenchDocumentCommandContext([
+    {
+      role: 'assistant',
+      content: [
+        '### 已查询到相关单据',
+        '',
+        '<article class="ai-document-card ai-document-card--application ai-document-card--approval-task is-pending">',
+        '<a class="ai-document-card__action" href="#ai-open-document-detail:claim_id%3Dapproval-1%26claim_no%3DAP-APPROVAL-001">查看详情</a>',
+        '</article>',
+        '<article class="ai-document-card ai-document-card--reimbursement ai-document-card--approval-task is-pending">',
+        '<a class="ai-document-card__action" href="#ai-open-document-detail:claim_id%3Dapproval-2%26claim_no%3DRE-APPROVAL-002">查看详情</a>',
+        '</article>'
+      ].join('\n')
+    }
+  ], { action: 'approve', safetyLevel: 'confirm_required' })
+
+  assert.equal(context?.candidates.length, 2)
+  assert.deepEqual(context.candidates[0], {
+    claimId: 'approval-1',
+    claimNo: 'AP-APPROVAL-001',
+    documentType: 'application',
+    actionLabel: '查看详情'
+  })
+
+  const guidance = buildWorkbenchDocumentCommandFollowupGuidance(context, { action: 'approve' })
+  assert.match(guidance.content, /已接上刚才查询到的待审单据/)
+  assert.match(guidance.content, /AP-APPROVAL-001/)
+  assert.match(guidance.content, /RE-APPROVAL-002/)
+  assert.equal(guidance.suggestedActions.length, 2)
+  assert.equal(guidance.suggestedActions[0].action_type, 'open_application_detail')
+  assert.equal(guidance.suggestedActions[0].payload.claim_id, 'approval-1')
+  assert.equal(guidance.suggestedActions[0].payload.command_action, 'approve')
+})
+
 test('workbench draft deletion intent is wired before draft slot continuation', () => {
   assert.match(commandIntentsScript, /isWorkbenchDraftDeletionIntent/)
+  assert.match(commandIntentsScript, /resolveLatestWorkbenchDocumentCommandContext/)
+  assert.match(commandIntentsScript, /buildWorkbenchDocumentCommandFollowupGuidance/)
   assert.match(commandIntentsScript, /function handleInlineDraftDeletionIntent\(cleanPrompt, entry = \{\}\)/)
   assert.match(commandIntentsScript, /resolveLatestWorkbenchDraftPayload\(conversationMessages\.value\)/)
   assert.match(commandIntentsScript, /buildWorkbenchDraftDeletionGuidance\(draftPayload\)/)