fix: require explicit choice for conflicting bid item sources

tests/bid-source.test.mjs

@@ -1,7 +1,21 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import {sourceRows,bidSourceSnapshot,restoreBidPrices} from '../src/services/bidSource.js';
+import {sourceRows,bidSourceSnapshot,restoreBidPrices,bidSourceOptions} from '../src/services/bidSource.js';
 const tender = {ikn:'2026/test',aciklama:'120 gün',items:[{id:1,ad:'Kit',miktar:10,birim:'adet'},{id:2,ad:'Cihaz',miktar:2,birim:'adet'}]};
+test('conflicting source inventories require explicit choice and invalidate that choice on change',()=>{
+ const results={itemsAndSpecs:[{name:'Kit',quantity:'20 adet'}],documentVersion:'v1'};
+ const options=bidSourceOptions(tender,results);
+ assert.equal(options.needsSelection,true);
+ const selection={source:'analysis',signature:options.signature};
+ assert.equal(bidSourceOptions(tender,results,selection).needsSelection,false);
+ assert.deepEqual(sourceRows(tender,results,'analysis').map(r=>r.quantity),['20 adet']);
+ assert.equal(bidSourceOptions(tender,{...results,documentVersion:'v2'},selection).needsSelection,true);
+ assert.equal(bidSourceOptions({...tender,items:[tender.items[0]]},results,selection).needsSelection,true);
+ assert.notEqual(bidSourceSnapshot(tender,results),bidSourceSnapshot(tender,{...results,itemsAndSpecs:[{name:'Kit',quantity:'30 adet'}]}));
+ const matching={itemsAndSpecs:[{name:'Cihaz',quantity:'2 adet'},{name:'Kit',quantity:'10 adet'}]};
+ assert.equal(bidSourceOptions(tender,matching).conflict,false);
+ assert.equal(bidSourceOptions({},results).conflict,false);
+});
 test('reordered source rows retain their own prices without invalidating identical content',()=>{
   const original=sourceRows(tender);
   const draft={priceSchema:1,pricesBySource:{[original[0].priceKey]:'15',[original[1].priceKey]:'900'}};