Bundle all the icons together.

build.zig

@@ -32,6 +32,21 @@ pub fn build(b: *std.Build) void {
 
     exe.root_module.addImport("ghostty-vt", ghostty.module("ghostty-vt"));
 
+    // The symbolic icons the app names are compiled into the binary, so that
+    // showing a terminal or web-browser glyph doesn't depend on which icon
+    // theme the host has installed. glib-compile-resources comes from the same
+    // Nix shell as GTK itself; the compiled bundle is embedded by src/icons.zig
+    // and registered at startup.
+    const gresource = b.addSystemCommand(&.{"glib-compile-resources"});
+    gresource.addArg("--sourcedir");
+    gresource.addDirectoryArg(b.path("assets/icons"));
+    gresource.addArg("--target");
+    const icons_gresource = gresource.addOutputFileArg("icons.gresource");
+    gresource.addFileArg(b.path("assets/icons/icons.gresource.xml"));
+    exe.root_module.addAnonymousImport("icons.gresource", .{
+        .root_source_file = icons_gresource,
+    });
+
     const gobject_imports = .{
         .{ "adw", "adw1" },
         .{ "cairo", "cairo1" },