ui: Add switch account icon to navigation menu

Author: Paras Upadhayay

assets/icons/ZulipIcons.ttf

@@ -540,10 +540,8 @@ class _SwitchAccountButton extends _MenuButton {
 
   @override
   // TODO(design): choose an icon
-  IconData? get icon => null;
+  IconData? get icon => ZulipIcons.switch_account;
 
-  @override
-  Widget buildLeading(BuildContext context) => const SizedBox.shrink();
 
   @override
   String label(ZulipLocalizations zulipLocalizations) {

assets/icons/switch_account.svg

@@ -117,14 +117,17 @@ abstract final class ZulipIcons {
   /// The Zulip custom icon "star_filled".
   static const IconData star_filled = IconData(0xf11f, fontFamily: "Zulip Icons");
 
+  /// The Zulip custom icon "switch_account".
+  static const IconData switch_account = IconData(0xf120, fontFamily: "Zulip Icons");
+
   /// The Zulip custom icon "topic".
-  static const IconData topic = IconData(0xf120, fontFamily: "Zulip Icons");
+  static const IconData topic = IconData(0xf121, fontFamily: "Zulip Icons");
 
   /// The Zulip custom icon "unmute".
-  static const IconData unmute = IconData(0xf121, fontFamily: "Zulip Icons");
+  static const IconData unmute = IconData(0xf122, fontFamily: "Zulip Icons");
 
   /// The Zulip custom icon "user".
-  static const IconData user = IconData(0xf122, fontFamily: "Zulip Icons");
+  static const IconData user = IconData(0xf123, fontFamily: "Zulip Icons");
 
   // END GENERATED ICON DATA
 }

lib/widgets/home.dart

@@ -1004,10 +1004,10 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"
       url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.10.1"
   sprintf:
     dependency: transitive
     description:
@@ -1092,26 +1092,26 @@ packages:
     dependency: "direct dev"
     description:
       name: test
-      sha256: "713a8789d62f3233c46b4a90b174737b2c04cb6ae4500f2aa8b1be8f03f5e67f"
+      sha256: "43490fe4c0f5ecb898f3fa1cdcdad8d521d7f6ff17ebdc4e8cd32b2e99524a20"
       url: "https://pub.dev"
     source: hosted
-    version: "1.25.8"
+    version: "1.25.13"
   test_api:
     dependency: "direct dev"
     description:
       name: test_api
-      sha256: "664d3a9a64782fcdeb83ce9c6b39e78fd2971d4e37827b9b06c3aa1edc5e760c"
+      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.3"
+    version: "0.7.4"
   test_core:
     dependency: transitive
     description:
       name: test_core
-      sha256: "12391302411737c176b0b5d6491f466b0dd56d4763e347b6714efbaa74d7953d"
+      sha256: "84d17c3486c8dfdbe5e12a50c8ae176d15e2a771b96909a9442b40173649ccaa"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.5"
+    version: "0.6.8"
   timing:
     dependency: transitive
     description: