Refactor CSS styles and ZenWorkspaces logic for improved UI consistency and functionality

src/browser/base/content/zen-styles/zen-popup.css

@@ -364,7 +364,7 @@ menuitem {
     color: var(--button-primary-color);
     box-shadow: var(--zen-big-shadow);
     display: flex;
-    font-weight: 600;
+    font-weight: 500;
     gap: 5px;
     flex-direction: column;
     gap: 2px;

src/browser/base/content/zen-styles/zen-urlbar.css

@@ -142,6 +142,10 @@
     visibility: collapse;
   }
 
+  #identity-icon-label {
+    display: none;
+  }
+
   #urlbar[open]
     :is(#tracking-protection-icon-container, .urlbar-page-action, .identity-box-button):not([hidden='true']):not(
       #identity-permission-box

src/browser/base/content/zen-styles/zen-workspaces.css

@@ -496,6 +496,7 @@
     white-space: nowrap;
     overflow: hidden;
     text-overflow: ellipsis;
+    pointer-events: none;
   }
 }
 

src/browser/base/zen-components/ZenWorkspaces.mjs

@@ -601,8 +601,7 @@ var ZenWorkspaces = new (class extends ZenMultiWindowFeature {
       this.selectEmptyTab();
       showed = true;
     } else {
-      const currentTabUrl = currentTab.linkedBrowser?.currentURI.spec;
-      if (currentTabUrl === 'about:newtab' || currentTabUrl === 'about:home') {
+      if (currentTab.isEmpty) {
         this.selectEmptyTab();
         gBrowser.removeTab(currentTab);
         showed = true;