Various changes.

build.zig

@@ -110,7 +110,7 @@ pub fn build(b: *std.Build) void {
 
     const run_cmd = b.addRunArtifact(exe);
     run_cmd.step.dependOn(b.getInstallStep());
-    if (b.args) |args| run_cmd.addArgs(args);
+    run_cmd.addPassthruArgs();
     b.step("run", "Run the app").dependOn(&run_cmd.step);
 
     // Tests are rooted at Layouts.zig rather than main.zig: the parts of this
@@ -319,7 +319,7 @@ fn addWebInputs(b: *std.Build, run: *std.Build.Step.Run) void {
 
     const io = b.graph.io;
     for ([_][]const u8{ "web/src", "web/public" }) |root| {
-        var dir = b.build_root.handle.openDir(io, root, .{ .iterate = true }) catch continue;
+        var dir = b.root.openDir(io, root, .{ .iterate = true }) catch continue;
         defer dir.close(io);
 
         var walker = dir.walk(b.allocator) catch continue;