feat(metrics): count toolbar button clicks

UI.toolbarBtn.terminal/appDrawer/extnMgr - one family so toolbar
engagement groups together in analytics. The extension manager metric
lives in ExtensionManagerDialog (the icon's live click handler), not in
the feature-gated Phoenix-extension-store binding.

Also picks up the regenerated Commands.md for the rebased view.enableAI
command doc.

Author: abose

docs/API-Reference/command/Commands.md

@@ -542,6 +542,12 @@ Toggles problems panel visibility
 ## VIEW\_TERMINAL
 Opens the terminal panel
 
+**Kind**: global variable  
+<a name="VIEW_ENABLE_AI"></a>
+
+## VIEW\_ENABLE\_AI
+Toggles whether AI features are enabled
+
 **Kind**: global variable  
 <a name="TOGGLE_LINE_NUMBERS"></a>
 

src/extensibility/ExtensionManagerDialog.js

@@ -432,7 +432,10 @@ define(function (require, exports, module) {
     CommandManager.register(Strings.CMD_EXTENSION_MANAGER, Commands.FILE_EXTENSION_MANAGER, _showDialog, { supportsDesignMode: true });
 
     AppInit.appReady(function () {
-        $("#toolbar-extension-manager").click(_showDialog);
+        $("#toolbar-extension-manager").click(function () {
+            Metrics.countEvent(Metrics.EVENT_TYPE.UI, "toolbarBtn", "extnMgr");
+            _showDialog();
+        });
     });
 
     // Unit tests

src/extensionsIntegrated/Terminal/main.js

@@ -889,6 +889,7 @@ define(function (require, exports, module) {
             .insertBefore("#app-drawer-button");
 
         $btn.on("click", function () {
+            Metrics.countEvent(Metrics.EVENT_TYPE.UI, "toolbarBtn", "terminal");
             if (WorkspaceManager.isInDesignMode()) {
                 CommandManager.execute(Commands.VIEW_TOGGLE_DESIGN_MODE);
                 CommandManager.execute(CMD_VIEW_TERMINAL);

src/view/DefaultPanelView.js

@@ -31,7 +31,8 @@ define(function (require, exports, module) {
         CommandManager = require("command/CommandManager"),
         Strings = require("strings"),
         WorkspaceManager = require("view/WorkspaceManager"),
-        PanelView = require("view/PanelView");
+        PanelView = require("view/PanelView"),
+        Metrics = require("utils/Metrics");
 
     /**
      * Descriptors for each launcher button.
@@ -182,6 +183,7 @@ define(function (require, exports, module) {
             .attr("title", Strings.BOTTOM_PANEL_DEFAULT_TITLE);
 
         $drawerBtn.on("click", function () {
+            Metrics.countEvent(Metrics.EVENT_TYPE.UI, "toolbarBtn", "appDrawer");
             // Design mode collapses the editor and stretches live preview, which
             // leaves no room for the bottom tools panel. Exit design mode first
             // so the panel has somewhere to go.