Update Helium to 0.16.3.1 and add Cargo module

Bump Helium AppImage version and update its SHA‑256 hash.
Add a new home module that installs a .cargo/config.toml with a custom
registry and enables git‑fetch‑with‑cli.

modules/home/cargo.nix

@@ -0,0 +1,17 @@
+_: {
+  # programs.cargo = {
+  #   enable = true;
+  #   cargoHome = "/home/${username}/.cargo";
+  #   settings = {
+  #     registries."gitea-garandplg".index = "sparse+https://gitea.garandplg.com/api/packages/GarandPLG/cargo/";
+  #     net.git-fetch-with-cli = true;
+  #   };
+  # };
+  home.file.".cargo/config.toml".text = ''
+    [registries]
+    gitea-garandplg = { index = "sparse+https://gitea.garandplg.com/api/packages/GarandPLG/cargo/" }
+
+    [net]
+    git-fetch-with-cli = true
+  '';
+}

modules/home/default.nix

@@ -17,6 +17,7 @@ _: {
     ./anki.nix
     ./bat.nix
     ./btop.nix
+    ./cargo.nix
     ./cava.nix
     ./easyeffects.nix
     ./eza.nix

modules/home/noctalia/default.nix

@@ -18,3 +18,4 @@
 #   programs.noctalia.settings = {
 #   };
 # }
+