Add a web browser tab.

build.zig

@@ -52,6 +52,11 @@ pub fn build(b: *std.Build) void {
     exe.root_module.linkSystemLibrary("gtk4", .{});
     exe.root_module.linkSystemLibrary("libadwaita-1", .{});
 
+    // WebKitGTK backs the web panes. There are no generated bindings for it in
+    // the zig-gobject set we use, so `src/webkit.zig` declares the handful of
+    // C entry points we need by hand and this links them.
+    exe.root_module.linkSystemLibrary("webkitgtk-6.0", .{});
+
     b.installArtifact(exe);
 
     const run_cmd = b.addRunArtifact(exe);