Bundle all the icons together.

src/main.zig

@@ -12,6 +12,7 @@ const gio = @import("gio");
 const Settings = @import("Settings.zig");
 const Window = @import("Window.zig");
 const appearance = @import("appearance.zig");
+const icons = @import("icons.zig");
 
 /// libghostty-vt logs unimplemented sequences at debug level, which is very
 /// chatty against a real shell. Keep the app's own warnings and errors.
@@ -50,6 +51,10 @@ fn onActivate(app: *adw.Application, _: ?*anyopaque) callconv(.c) void {
     // user chose rather than repainted into it a moment later.
     appearance.init();
 
+    // Same reasoning: the bundled icons are registered before anything asks
+    // for one by name.
+    icons.init();
+
     const window = Window.create(gpa.allocator(), app) catch |err| {
         std.log.err("failed to create window: {s}", .{@errorName(err)});
         return;