api#326 Числовые UTM и новый шум каждого перехода

tests/e2e/utm-handoff.cjs

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+// api#326: реальный handoff codec, включая сохранённые legacy records.
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const vm = require('node:vm');
+const source = fs.readFileSync('/app/components/utm-handoff.php','utf8').split("<<<'JS'\n")[1].split('\nJS;')[0];
+const context = {window:{},URLSearchParams,Uint8Array,crypto:require('node:crypto').webcrypto};
+vm.runInNewContext(source,context);
+const handoff=context.window.ZoomzillaUtmHandoff;
+const defaults={indpic:'1',theme:'1',degr:'1',reg:'2',chob:'2',tp:'1',cons:'2',focus:'1'};
+const selected={indpic:'2',theme:'2',degr:'2',reg:'1',chob:'1',tp:'2',cons:'3',focus:'2'};
+const foreign='utm_source=abcd9same&subid=%D1%82%D0%B5%D1%81%D1%82+%2B+%26&id=42&stage=keep';
+for(const meta of [
+ {redirectUtm:foreign,utmDigits:selected},
+ {redirectUtm:foreign+'&indpic=2&theme=light&degr=2&registration=before&bchoice=b&tp=2&cons=3&focus=center&chb=a'},
+ {redirectUtm:foreign+'&indpic=abcd2&theme=абвг2&degr=abcd2&reg=abcd1&chob=abcd1&tp=abcd2&cons=abcd3&focus=abcd2'}
+]){
+ const before=JSON.stringify(meta);
+ const first=new URLSearchParams(handoff.query(meta,defaults));
+ const second=new URLSearchParams(handoff.query(meta,defaults));
+ for(const [key,digit] of Object.entries(selected)){
+  assert.match(first.get(key),/^[A-Za-z0-9]{10}$/);
+  assert.equal(first.get(key)[4],digit);
+  assert.equal(second.get(key)[4],digit);
+  assert.notEqual(first.get(key),second.get(key));
+ }
+ for(const query of [first,second]){
+  assert.equal(query.get('utm_source'),'abcd9same');
+  assert.equal(query.get('subid'),'тест + &');
+  assert.equal(query.get('id'),'42'); assert.equal(query.get('stage'),'keep');
+  for(const legacy of ['registration','bchoice','chb'])assert.equal(query.has(legacy),false);
+ }
+ assert.equal(JSON.stringify(meta),before);
+}
+const typeIn=new URLSearchParams(handoff.query({redirectUtm:'',utmDigits:defaults},defaults));
+for(const [key,digit]of Object.entries(defaults))assert.equal(typeIn.get(key)[4],digit);
+console.log('OK: all8 fresh noise/repeated handoff, legacy recovery, type-in, foreign/technical values');