diff --git a/.github/scripts/fix-v1766-e2e.mjs b/.github/scripts/fix-v1766-e2e.mjs
new file mode 100644
index 0000000..67bccbe
--- /dev/null
+++ b/.github/scripts/fix-v1766-e2e.mjs
@@ -0,0 +1,24 @@
+import fs from 'node:fs';
+const f='tests/app.spec.mjs';
+let s=fs.readFileSync(f,'utf8');
+const replace=(a,b,label)=>{if(!s.includes(a))throw new Error(label+' not found');s=s.replace(a,b)};
+replace("  await page.waitForFunction(()=>Boolean(document.querySelector('header nav .nav-menu .sun-v1764-menu-icon')),null,{timeout:5000});","  await page.waitForFunction(()=>document.querySelector('header nav .nav-menu')?.dataset?.sunMenuIconV1766==='1',null,{timeout:5000});",'old menu wait');
+replace("    return {one:one?.clientOfferTemplateId,snapOne:one?.clientOfferSnapshot?.offerTemplateId,two:two?.clientOfferSnapshot?.offerTemplateId,icon:Boolean(document.querySelector('header nav .nav-menu .sun-v1764-menu-icon'))};","    const menu=document.querySelector('header nav .nav-menu');return {one:one?.clientOfferTemplateId,snapOne:one?.clientOfferSnapshot?.offerTemplateId,two:two?.clientOfferSnapshot?.offerTemplateId,icon:menu?.dataset?.sunMenuIconV1766==='1',inlineIcon:menu?.querySelectorAll('.sun-v1764-menu-icon').length||0};",'old menu result');
+replace("  expect(result.icon).toBeTruthy();\n});\ntest('Developer Console","  expect(result.icon).toBeTruthy();\n  expect(result.inlineIcon).toBe(0);\n});\ntest('Developer Console",'inline icon assertion');
+const start="test('v17.6.6 Menu sidebar icon uses native mask and has no duplicate inline SVG', async ({ page }) => {";
+const end="test('v17.6.6 proposal templates preserve selection and expose four structural previews'";
+const a=s.indexOf(start),b=s.indexOf(end,a);
+if(a<0||b<0)throw new Error('v17.6.6 icon test boundaries not found');
+const replacement=`test('v17.6.6 Menu sidebar icon uses native mask and has no duplicate inline SVG', async ({ page }) => {
+  await page.goto('/index.html',{waitUntil:'domcontentloaded'});
+  await page.evaluate(()=>{let nav=document.querySelector('header nav');if(!nav){const h=document.createElement('header');nav=document.createElement('nav');h.appendChild(nav);document.body.prepend(h)}let b=nav.querySelector('.nav-menu');if(!b){b=document.createElement('button');b.className='sun-nav-button nav-menu';b.dataset.navLabel='Меню';b.textContent='Меню';nav.appendChild(b)}});
+  await injectCore(page,'ux-fixes-v1764.js','SunUXFixV1764');
+  await page.waitForFunction(()=>document.querySelector('.nav-menu')?.dataset?.sunMenuIconV1766==='1',null,{timeout:5000});
+  const r=await page.evaluate(()=>{const b=document.querySelector('.nav-menu');return {inline:b.querySelectorAll('.sun-v1764-menu-icon').length,marker:b.dataset.sunMenuIconV1766,label:b.textContent.trim()}});
+  const uxSource=fs.readFileSync(path.join(process.cwd(),'public','core','ux-fixes-v1764.js'),'utf8');
+  expect(r.inline).toBe(0);expect(r.marker).toBe('1');expect(r.label).toContain('Меню');expect(uxSource).toContain('--sun-icon:url(');
+});
+
+`;
+s=s.slice(0,a)+replacement+s.slice(b);
+fs.writeFileSync(f,s);