Updated the Network List Connect button icon on GTK3 to use the bundled zc-menu-connect asset, which avoids theme-dependent missing network-connect behavior.

Added a Help menu _Update entry with a dedicated zc-menu-update icon constant, so Windows builds can display an appropriate update icon in the Help menu.

    Extended icon mapping/fallback logic so emoji/update icons resolve correctly across stock/icon-name paths (zc-menu-emoji, zc-menu-update) including GTK2 stock fallback compatibility.

    Added zc-menu-emoji to the input entry fallback icon list so the emoji affordance has a deterministic built-in fallback when theme emoji icons are missing.

    Added new update and emoji icon assets in both SVG and PNG for light/dark variants, and registered the PNG resources in the gresource manifest for runtime loading.

src/fe-gtk/maingui.c

@@ -3545,6 +3545,7 @@ mg_create_entry (session *sess, GtkWidget *box)
                 "face-smile",
                 "insert-emoticon-symbolic",
                 "insert-emoticon",
+                "zc-menu-emoji",
                 NULL
         };
         const char *emoji_fallback_icon_name;