Fix preview control layers and centred settings icons in YouTubeDL 1.4.6

tests/ui-fixture.js

@@ -31,7 +31,7 @@
     ], audios: [{ id: "251", codec: "opus", extension: "webm", bitrate: 160, language: "en", note: "English", size: 5000000 }] };
   window.chrome = {
     runtime: {
-      getManifest: () => ({ version: window.__extensionVersion || "1.4.5" }),
+      getManifest: () => ({ version: window.__extensionVersion || "1.4.6" }),
       getURL: file => `https://ui.ytdl.test/${file}`,
       sendMessage: async message => {
         if (message.type === "QUICK_DOWNLOAD") { window.__quickRequests.push(message.url); return { ok: true, jobId: "fixture-job" }; }