refactor: refactor smart entry as standalone modal overlay

- Convert TravelReimbursementCreateView from page to modal overlay
- Simplify App.vue navigation flow with smartEntryOpen state
- Add create-request button in RequestsView

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/App.vue

@@ -72,12 +72,7 @@
 
         <PersonalWorkbenchView
           v-else-if="activeView === 'workbench'"
-          @open-assistant="handleOpenChat"
-        />
-
-        <TravelReimbursementCreateView
-          v-else-if="activeView === 'chat' && travelCreateMode"
-          @back-to-requests="backToRequests"
+          @open-assistant="openSmartEntry"
         />
 
         <ChatView
@@ -102,6 +97,7 @@
           v-else-if="activeView === 'requests' && detailMode"
           :request="selectedTravelRequest"
           @back-to-requests="closeRequestDetail"
+          @open-assistant="openSmartEntry"
         />
 
         <RequestsView
@@ -121,6 +117,14 @@
       </section>
     </main>
 
+    <TravelReimbursementCreateView
+      v-if="smartEntryOpen"
+      :key="smartEntrySessionId"
+      :initial-prompt="smartEntryContext.prompt"
+      :entry-source="smartEntryContext.source"
+      :request-context="smartEntryContext.request"
+      @close="closeSmartEntry"
+    />
   </div>
 
   <ToastNotification :toast-text="toastText" />
@@ -155,6 +159,9 @@ const loggedIn = ref(false)
 const travelCreateMode = ref(false)
 const detailMode = ref(false)
 const selectedTravelRequest = ref(null)
+const smartEntryOpen = ref(false)
+const smartEntryContext = ref({ prompt: '', source: 'requests', request: null })
+const smartEntrySessionId = ref(0)
 
 function handleLogin(credentials) {
   if (credentials.username && credentials.password) {
@@ -180,7 +187,7 @@ const customRange = ref({ start: '2024-07-06', end: '2024-07-12' })
 const travelPrompts = ['帮我提交出差申请', '预订机票', '预订酒店', '预订火车票', '查询差旅政策']
 
 const topBarView = computed(() => {
-  if (travelCreateMode.value || detailMode.value) {
+  if (detailMode.value) {
     return {
       title: '差旅报销详情',
       desc: '查看报销单据详情、票据识别与审批进度'
@@ -211,6 +218,7 @@ function handleNavigate(view) {
   travelCreateMode.value = false
   detailMode.value = false
   selectedTravelRequest.value = null
+  smartEntryOpen.value = false
   setView(view)
 }
 
@@ -220,15 +228,29 @@ function handleOpenChat(request) {
 }
 
 function openTravelCreate() {
-  travelCreateMode.value = true
+  smartEntryOpen.value = true
+  travelCreateMode.value = false
   detailMode.value = false
   selectedTravelRequest.value = null
-  activeView.value = 'chat'
+  smartEntryContext.value = { prompt: '', source: 'topbar', request: null }
+  smartEntrySessionId.value += 1
 }
 
-function backToRequests() {
+function openSmartEntry(payload = {}) {
+  smartEntryOpen.value = true
   travelCreateMode.value = false
-  activeView.value = 'requests'
+  detailMode.value = false
+  selectedTravelRequest.value = null
+  smartEntryContext.value = {
+    prompt: payload.prompt ?? '',
+    source: payload.source ?? 'workbench',
+    request: payload.request ?? null
+  }
+  smartEntrySessionId.value += 1
+}
+
+function closeSmartEntry() {
+  smartEntryOpen.value = false
 }
 
 function openRequestDetail(request) {