fix: remove all remaining uses of the term NixOS

Of particular importance is the change in the README to make it clear
that Nix is not so much a distribution as it is an universal package
distribution option on par with Flatpak and Snap.

CONTRIBUTING.md

@@ -33,7 +33,7 @@ All applications are defined in [`src/lib/data.ts`](src/lib/data.ts).
     arch: 'package-name',           // Use AUR package names with -bin suffix
     fedora: 'package-name',
     opensuse: 'package-name',
-    nixos: 'package-name',
+    nix: 'package-name',
     flatpak: 'com.vendor.AppId',    // Full Flatpak ID
     snap: 'snap-name',              // Include --classic if needed
   },
@@ -218,7 +218,7 @@ Open a [Discussion](https://github.com/abusoww/tuxmate/discussions) or create an
     arch: 'package-name',           // Use AUR package names with -bin suffix
     fedora: 'package-name',
     opensuse: 'package-name',
-    nixos: 'package-name',
+    nix: 'package-name',
     flatpak: 'com.vendor.AppId',    // Full Flatpak ID
     snap: 'snap-name',              // Include --classic if needed
   },

README.md

@@ -28,7 +28,7 @@ a new machine or can't remember all the package names for your favorite apps?
 - Arch Linux (pacman + AUR via yay)
 - Fedora (dnf)
 - openSUSE (zypper)
-- NixOS (nix-env)
+- Nix (nix-env)
 - Flatpak
 - Snap
 
@@ -107,8 +107,8 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for contribution guidelines.
 ## 🎯 Roadmap
 
 ### Completed
-- [x] Multi-distro support (Ubuntu, Debian, Arch, Fedora, openSUSE, NixOS)
-- [x] Flatpak & Snap universal package support
+- [x] Multi-distro support (Ubuntu, Debian, Arch, Fedora, openSUSE)
+- [x] Nix, Flatpak & Snap universal package support
 - [x] 150+ applications across 15 categories
 - [x] Smart script generation with error handling
 - [x] AUR helper integration (yay) for Arch
@@ -139,4 +139,4 @@ Free software — you can redistribute and modify it under the terms of the GNU
 
 <p align="center">
 	<img src="https://raw.githubusercontent.com/catppuccin/catppuccin/main/assets/footers/gray0_ctp_on_line.svg?sanitize=true" />
-</p>
+</p>

src/hooks/useLinuxInit.ts

@@ -195,9 +195,9 @@ export function useLinuxInit(): UseLinuxInitReturn {
 
         if (packageNames.length === 0) return '# No packages selected';
 
-        // Handle special cases for NixOS and Snap
+        // Handle special cases for Nix and Snap
         if (selectedDistro === 'nix') {
-            // NixOS needs nixpkgs. prefix for each package
+            // Nix needs nixpkgs. prefix for each package
             return `${distro.installPrefix} ${packageNames.map(p => `nixpkgs.${p}`).join(' ')}`;
         }
 

src/lib/generateInstallScript.ts

@@ -542,11 +542,11 @@ print_summary
 }
 
 // ═══════════════════════════════════════════════════════════════════════════════
-//  NIXOS SCRIPT
+//  NIX SCRIPT
 // ═══════════════════════════════════════════════════════════════════════════════
 
-function generateNixOSScript(packages: { app: AppData; pkg: string }[]): string {
-    return generateAsciiHeader('NixOS', packages.length) + generateSharedUtils(packages.length) + `
+function generateNixScript(packages: { app: AppData; pkg: string }[]): string {
+    return generateAsciiHeader('Nix', packages.length) + generateSharedUtils(packages.length) + `
 is_installed() { nix-env -q 2>/dev/null | grep -q "$1"; }
 
 install_pkg() {
@@ -796,7 +796,7 @@ export function generateInstallScript(options: ScriptOptions): string {
         case 'arch': return generateArchScript(packages);
         case 'fedora': return generateFedoraScript(packages);
         case 'opensuse': return generateOpenSUSEScript(packages);
-        case 'nix': return generateNixOSScript(packages);
+        case 'nix': return generateNixScript(packages);
         case 'flatpak': return generateFlatpakScript(packages);
         case 'snap': return generateSnapScript(packages);
         default: return '#!/bin/bash\necho "Unsupported distribution"\nexit 1';
@@ -822,4 +822,4 @@ export function generateSimpleCommand(selectedAppIds: Set<string>, distroId: Dis
             return packages.map(p => `sudo snap install ${p.pkg}`).join(' && ');
         default: return `# Install: ${pkgList}`;
     }
-}
+}