feat: Dont trim the urlbar when it's open, b=(no-bug), c=common

src/zen/common/ZenUIManager.mjs

@@ -397,7 +397,11 @@ var gZenUIManager = {
   },
 
   urlbarTrim(aURL) {
-    if (gZenVerticalTabsManager._hasSetSingleToolbar && this.urlbarShowDomainOnly) {
+    if (
+      gZenVerticalTabsManager._hasSetSingleToolbar &&
+      this.urlbarShowDomainOnly &&
+      !gURLBar.hasAttribute('breakout-extend')
+    ) {
       let url = BrowserUIUtils.removeSingleTrailingSlashFromURL(aURL);
       return url.startsWith('https://') ? url.split('/')[2] : url;
     }

src/zen/common/styles/zen-urlbar.css

@@ -101,6 +101,10 @@
   outline: none !important;
 }
 
+#urlbar .urlbar-input {
+  border-radius: 0 !important;
+}
+
 :root[zen-single-toolbar='true'] #urlbar:not([breakout-extend='true']) {
   & #urlbar-input {
     cursor: default;