feat(loop): Add Loop corporate messenger package

Add Loop v6.0.3 - a corporate messenger distributed as a pre-built x86-64 binary.
Uses autoPatchelfHook and wrapGAppsHook3 for NixOS compatibility.

packages/loop/default.nix

@@ -0,0 +1,2 @@
+{ pkgs, ... }:
+pkgs.callPackage ./package.nix { }

packages/loop/package.nix

@@ -0,0 +1,138 @@
+{
+  lib,
+  stdenv,
+  fetchurl,
+  autoPatchelfHook,
+  makeWrapper,
+  wrapGAppsHook3,
+  gtk3,
+  glib,
+  libdrm,
+  mesa,
+  nss,
+  nspr,
+  alsa-lib,
+  dbus,
+  cups,
+  libxkbcommon,
+  xorg,
+  systemd,
+  libnotify,
+  libsecret,    libappindicator-gtk3,
+    gsettings-desktop-schemas,
+}:
+
+let
+  version = "6.0.3";
+  pname = "loop";
+in
+
+stdenv.mkDerivation {
+  inherit pname version;
+
+  src = fetchurl {
+    url = "https://artifacts.wilix.dev/repository/loop-files/loop-${version}/loop-desktop-${version}-linux-x64.tar.gz";
+    hash = "sha256-xqbESTUYHumdVbxcaMi838wgCVBH05KfsBZB+QOwNhk=";
+  };
+
+  nativeBuildInputs = [
+    autoPatchelfHook
+    makeWrapper
+    wrapGAppsHook3
+  ];
+
+  buildInputs = [
+    stdenv.cc.cc.lib
+    gtk3
+    glib
+    libdrm
+    mesa
+    nss
+    nspr
+    alsa-lib
+    dbus
+    cups
+    libxkbcommon
+    xorg.libX11
+    xorg.libXcomposite
+    xorg.libXdamage
+    xorg.libXext
+    xorg.libXfixes
+    xorg.libXrandr
+    xorg.libxcb
+    xorg.libxshmfence
+    systemd
+    libnotify
+    libsecret
+    libappindicator-gtk3
+    gsettings-desktop-schemas
+  ];
+
+  dontBuild = true;
+  dontStrip = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p "$out/share/loop" "$out/bin" "$out/share/applications" "$out/share/icons/hicolor/256x256/apps"
+
+    cp -r . "$out/share/loop/"
+
+    # Find and symlink the main executable
+    if [ -f "$out/share/loop/loop" ]; then
+      ln -s "$out/share/loop/loop" "$out/bin/loop"
+    elif [ -f "$out/share/loop/Loop" ]; then
+      ln -s "$out/share/loop/Loop" "$out/bin/loop"
+    elif [ -f "$out/share/loop/loop-desktop" ]; then
+      ln -s "$out/share/loop/loop-desktop" "$out/bin/loop"
+    else
+      # Try to find any executable
+      for f in "$out/share/loop/"*; do
+        if [ -x "$f" ] && [ ! -d "$f" ]; then
+          ln -s "$f" "$out/bin/loop"
+          break
+        fi
+      done
+    fi
+
+    # Desktop entry
+    cat > "$out/share/applications/loop.desktop" << EOF
+[Desktop Entry]
+Name=Loop
+Comment=Corporate messenger for your team
+Exec=$out/bin/loop
+Icon=loop
+Terminal=false
+Type=Application
+Categories=Network;InstantMessaging;
+EOF
+
+    # Install icon if present
+    if [ -f "$out/share/loop/loop-desktop.png" ]; then
+      cp "$out/share/loop/loop-desktop.png" "$out/share/icons/hicolor/256x256/apps/loop.png"
+    elif [ -f "$out/share/loop/app_icon.png" ]; then
+      cp "$out/share/loop/app_icon.png" "$out/share/icons/hicolor/256x256/apps/loop.png"
+    fi
+
+    runHook postInstall
+  '';
+
+  passthru = {
+    category = "Communication";
+    updateScript = [
+      "nix-update"
+      "--flake"
+      ".#loop"
+    ];
+  };
+
+  meta = with lib; {
+    description = "Corporate messenger for your team";
+    homepage = "https://wilix.dev/loop";
+    license = licenses.unfree;
+    maintainers = with maintainers; [ ];
+    platforms = [ "x86_64-linux" ];
+    mainProgram = "loop";
+    sourceProvenance = with sourceTypes; [ binaryNativeCode ];
+  };
+}