Distinguish shared item inventory from tender rows and load errors

tests/shared-items.test.mjs

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+import {test} from 'node:test';
+import assert from 'node:assert/strict';
+import {kalemleriGetir} from '../src/services/kalem.js';
+test('empty shared inventory is distinct from HTTP errors and malformed responses',async()=>{
+ const original=globalThis.fetch;
+ try {
+  globalThis.fetch=async()=>Response.json({success:true,kalemler:[]});
+  assert.deepEqual((await kalemleriGetir('2026/123')).kalemler,[]);
+  for(const response of [Response.json({success:true,kalemler:[]},{status:503}),Response.json({success:true}),new Response('Bad gateway')]) {
+   globalThis.fetch=async()=>response;await assert.rejects(kalemleriGetir('2026/123'),/alınamadı/);
+  }
+ } finally {globalThis.fetch=original;}
+});
+test('shared inventory waits are bounded and can be cancelled on tender change',async()=>{
+ const original=globalThis.fetch;
+ try {
+  globalThis.fetch=async(url,{signal})=>new Promise((resolve,reject)=>{
+   const cancel=()=>reject(new DOMException('Aborted','AbortError'));
+   if(signal.aborted)cancel();else signal.addEventListener('abort',cancel,{once:true});
+  });
+  await assert.rejects(kalemleriGetir('2026/123',{timeoutMs:5}),/zaman aşımı/);
+  const c=new AbortController();const pending=kalemleriGetir('2026/123',{signal:c.signal});c.abort();
+  await assert.rejects(pending,{name:'AbortError'});
+ } finally {globalThis.fetch=original;}
+});