Harden PWA installability and offline boot by removing manifest duplication

app.js

@@ -572,7 +572,7 @@ function openAppModal(kind){
 function closeAppModal(){ if(!appModal) return; appModal.classList.remove('visible'); appModal.setAttribute('aria-hidden','true'); }
 
 async function loadManifestVersion(){
-  try{ const res = await fetch('manifest.webmanifest', {cache:'no-store'}); const m = await res.json(); appVersion = m.version || '1.2'; versionEl.textContent = `v${appVersion}`; } catch { versionEl.textContent = `v${appVersion}`; }
+  try{ const res = await fetch('manifest.webmanifest'); const m = await res.json(); appVersion = m.version || '1.2'; versionEl.textContent = `v${appVersion}`; } catch { versionEl.textContent = `v${appVersion}`; }
 }
 function showApp(){ app.hidden = false; renderView('home'); setTimeout(()=>splash.classList.add('is-hidden'), 850); setTimeout(()=>splash.remove(), 1300); }
 

js/app-main.js

@@ -57,7 +57,7 @@ async function loadManifestVersion() {
   if (!versionEl) return;
 
   try {
-    const res = await fetch('manifest.webmanifest', { cache: 'no-store' });
+    const res = await fetch('manifest.webmanifest');
     const manifest = await res.json();
     versionEl.textContent = `v${manifest.version || CONFIG.APP_VERSION}`;
   } catch {

sw.js

@@ -7,7 +7,6 @@ const APP_SHELL = [
   './styles.css',
   './app.js',
   './manifest.webmanifest',
-  './manifest.json',
   './sw.js',
   './assets/easytune-logo.png',
   './icons/favicon.ico',