Add Helium AppImage and replace Chromium webapps

- Add Helium browser as an AppImage and include it in system packages.
- Rename fluxer package into the appimages module and update imports.
- Add `SUPER+H` keybinding to launch Helium and `SUPER+CONTROL+T` for
  tsukimi.
- Change web‑app desktop entries to use Helium instead of Chromium.
- Disable ungoogled‑chromium and ChatGPT modules on the laptop host.
- Fix a minor typo in a comment within hardware.nix.

modules/core/packages/appimages/default.nix

@@ -0,0 +1,6 @@
+{pkgs, ...}: let
+  fluxer = pkgs.callPackage ./fluxer.nix {};
+  helium = pkgs.callPackage ./helium.nix {};
+in {
+  environment.systemPackages = [fluxer helium];
+}

modules/core/packages/appimages/helium.nix

@@ -0,0 +1,37 @@
+{
+  lib,
+  appimageTools,
+  fetchurl,
+}: let
+  pname = "helium";
+  version = "0.11.7.1";
+
+  src = fetchurl {
+    url = "https://github.com/imputnet/helium-linux/releases/download/0.11.7.1/helium-0.11.7.1-x86_64.AppImage";
+    sha256 = "sha256-qzc135IP5F2btxtOMUGMz+0azJhYL9KI0lcPG2KjcxU=";
+  };
+  appimageContents = appimageTools.extract {inherit pname version src;};
+in
+  appimageTools.wrapType2 {
+    inherit pname version src;
+
+    extraInstallCommands = ''
+      # mv $out/bin/${pname}-${version} $out/bin/${pname}
+      install -m 444 -D ${appimageContents}/${pname}.desktop $out/share/applications/${pname}.desktop
+      install -m 444 -D ${appimageContents}/usr/share/icons/hicolor/256x256/apps/${pname}.png \
+        $out/share/icons/hicolor/256x256/apps/${pname}.png
+      # substituteInPlace $out/share/applications/${pname}.desktop \
+      #   --replace-fail 'Exec=AppRun' 'Exec=${pname}'
+    '';
+
+    meta = with lib; {
+      description = "Helium browser";
+      homepage = "https://github.com/imputnet/helium";
+      license = licenses.agpl3Plus;
+      platforms = ["x86_64-linux"];
+      sourceProvenance = with lib.sourceTypes; [binaryNativeCode];
+      maintainers = with lib.maintainers; [garand_plg];
+    };
+  }
+# https://github.com/imputnet/helium-linux/releases/download/0.11.7.1/helium-0.11.7.1-x86_64.AppImage
+

modules/core/packages/default.nix

@@ -1,7 +1,7 @@
 _: {
   nixpkgs.config.allowUnfree = true;
   imports = [
-    ./fluxer
+    ./appimages
     ./essentials.nix
     ./packages.nix
     ./programs.nix

modules/core/packages/fluxer/default.nix

@@ -1,6 +0,0 @@
-{pkgs, ...}: let
-  fluxer =
-    pkgs.callPackage ./fluxer-package.nix {};
-in {
-  environment.systemPackages = [fluxer];
-}