fix: overhaul PWA icons with v2 suffix to bust all cache layers

- Redesign favicon SVG with gradient border matching splash screen
- Rename all icon files with -v2 suffix to bypass browser/SW/PWA caches
- Delete 9 old/duplicate icon files (~13MB removed)
- Add nginx cache-control headers for icons and manifest
- Rename assets-cache to assets-cache-v2 to orphan stale SW cache
- Update all HTML, manifest, and component icon references

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/dev-dist/sw.js

@@ -82,11 +82,12 @@ define(['./workbox-21a80088'], (function (workbox) { 'use strict';
     "revision": "3ca0b8505b4bec776b69afdba2768812"
   }, {
     "url": "index.html",
-    "revision": "0.0ddc43l70qk"
+    "revision": "0.qqvn6d3mva8"
   }], {});
   workbox.cleanupOutdatedCaches();
   workbox.registerRoute(new workbox.NavigationRoute(workbox.createHandlerBoundToURL("index.html"), {
-    allowlist: [/^\/$/]
+    allowlist: [/^\/$/],
+    denylist: [/^\/app\//, /^\/rpc\//, /^\/ws/, /^\/aiui\//]
   }));
   workbox.registerRoute(/^https:\/\/fonts\.googleapis\.com\/.*/i, new workbox.CacheFirst({
     "cacheName": "google-fonts-cache",