refactor(nix/darwin): Swap ESC<->CapsLock with Kanata

nix/overlays/darwin/kanata.nix

@@ -0,0 +1,29 @@
+# Because building from source is broken due to `sw_vers` usage
+#
+# REF: https://github.com/NixOS/nixpkgs/pull/306546#issuecomment-2284484876
+# REF: https://github.com/jtroo/kanata/issues/1209
+final: prev:
+
+{
+  kanata = final.stdenv.mkDerivation rec {
+    name = "kanata";
+    version = "v1.7.0";
+
+    src = final.fetchurl {
+      url = "https://github.com/jtroo/kanata/releases/download/${version}/kanata_macos_" +
+        (if final.stdenv.hostPlatform.isAarch64 then "arm64" else "x86_64");
+      sha256 =
+        if final.stdenv.hostPlatform.isAarch64 then
+          "83ad80fbaf8c7b0ec0e17052a02ca0b3057cbbeaf8a023a61541f1514a936b43"
+        else
+          "e3f0d99e512a84c5cae1f63e71c07ecdbff66dc89b053aba0abb4f9dee0cadc0";
+    };
+
+    phases = ["installPhase" "patchPhase"];
+    installPhase = ''
+      mkdir -p $out/bin
+      cp $src $out/bin/kanata
+      chmod +x $out/bin/kanata
+    '';
+  };
+}