refactor: Update ZenWorkspaces to enable setting default workspace and opening workspaces

src/browser/base/content/zen-popupset.inc.xhtml

@@ -129,5 +129,8 @@
 <menupopup id="zenWorkspaceActionsMenu"
             onpopupshowing="ZenWorkspaces.updateContextMenu(this);"
             onpopuphidden="ZenWorkspaces.onContextMenuClose();">
+  <menuitem id="context_zenOpenWorkspace" oncommand="ZenWorkspaces.openWorkspace();" data-l10n-id="zen-workspaces-panel-context-open"/>
+  <menuseparator/>
+  <menuitem id="context_zenSetAsDefaultWorkspace" oncommand="ZenWorkspaces.setDefaultWorkspace();" data-l10n-id="zen-workspaces-panel-context-set-default"/>
   <menuitem id="context_zenDeleteWorkspace" oncommand="ZenWorkspaces.contextDelete();" data-l10n-id="zen-workspaces-panel-context-delete"/>
 </menupopup>

src/browser/locales/en-US/browser/zen-workspaces.ftl

@@ -16,6 +16,14 @@ zen-workspaces-panel-context-delete =
     .label = Delete Workspace
     .accesskey = D
 
+zen-workspaces-panel-context-open = 
+    .label = Open Workspace
+    .accesskey = O
+
+zen-workspaces-panel-context-set-default =
+    .label = Set As Default Workspace
+    .accesskey = S
+
 context-zen-change-workspace-tab = 
     .label = Change Tab(s) To Workspace
     .accesskey = C

src/browser/themes/shared/zen-icons/icons.css

@@ -152,6 +152,14 @@
 	list-style-image: url("open.svg") !important;
 }
 
+#context_zenOpenWorkspace {
+	--menu-image: url("open.svg") !important;
+}
+
+#context_zenSetAsDefaultWorkspace {
+	--menu-image: url("bookmark-hollow.svg") !important;
+}
+
 #add-ons-button,
 #appMenu-extensions-themes-button,
 #unified-extensions-button {