R62 Fix A1-A6：请假预览全非工作日处理

server/src/routes/leave.js

@@ -233,10 +233,13 @@ function buildNaturalWorkingDaysPreview(body) {
     weekendDayCount: 0,
     adjustedWorkdayCount: 0,
     calendarApplied: false,
+    isNonWorkingRange: false,
   };
 }
 
-async function resolveWorkingDaysPreview(fastify, employee, body) {
+async function resolveWorkingDaysPreview(fastify, employee, body, options = {}) {
+  const allowNonWorkingRange = Boolean(options.allowNonWorkingRange);
+
   if (!employee?.legal_entity_id) {
     return buildNaturalWorkingDaysPreview(body);
   }
@@ -288,11 +291,14 @@ async function resolveWorkingDaysPreview(fastify, employee, body) {
     startSession: body.startSession,
     endSession: body.endSession,
     calendarDays: calendar.days,
+    allowNonWorkingRange,
   });
 }
 
 async function resolveRequestedDaysForCreate(fastify, employee, body) {
-  const preview = await resolveWorkingDaysPreview(fastify, employee, body);
+  const preview = await resolveWorkingDaysPreview(fastify, employee, body, {
+    allowNonWorkingRange: false,
+  });
   return preview.requestedDays;
 }
 
@@ -579,7 +585,9 @@ async function leaveRoutes(fastify) {
     },
     async (request, reply) => {
       const query = parseWorkingDaysPreviewQuery(request.query);
-      const preview = await resolveWorkingDaysPreview(fastify, request.employee, query);
+      const preview = await resolveWorkingDaysPreview(fastify, request.employee, query, {
+        allowNonWorkingRange: true,
+      });
 
       return sendData(reply, request, preview);
     },