Switch desktop environment from Hyprland to Pantheon

Configures Pantheon (LightDM + gala) for daily use on this ASUS TUF
Gaming A15 (FA507NU), and drops everything that only existed to serve
the previous Hyprland/Quickshell setup:

- desktop.nix: services.desktopManager.pantheon instead of
  programs.hyprland + greetd; comfy laptop touchpad defaults.
- drivers.nix: NVIDIA PRIME render offload between the AMD Radeon 680M
  (drives the panel) and the RTX 4050 Max-Q (offload-only), using this
  machine's real PCI bus IDs; asusd/supergfxd for ASUS-specific laptop
  control.
- apps.nix / scripts.nix: removed Hyprland/Quickshell-only packages and
  scripts (kitty, rofi, quickshell, mako, hyprlock, hyprpaper/mpvpaper,
  the Quickshell theme-picker scripts, cursor/wallpaper/display
  helpers) — Pantheon ships its own Files/Terminal/Screenshot/
  notifications/theming natively. Kept the DE-agnostic scripts (vault
  toggle, metadata stripping, brightness control, Wi-Fi hotspot,
  telemetry, weather).
- theme.nix and default-apps.nix deleted entirely — Pantheon owns
  GTK/icon theming itself, no more live dconf/CSS generation pipeline
  needed.
- Deleted hyprland/ and dotfiles/ (kitty, mako, quickshell, rofi).

Verified with `nixos-rebuild build`.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RpiovBQL6k5MTDMN3Ln9nL

modules/apps.nix

@@ -0,0 +1,56 @@
+{ config, pkgs, ... }:
+
+{
+  # Every installed package — GUI apps, CLI tools, and dev toolchains alike.
+  # If it's "install X", it goes here.
+  users.users."nexoniarz".packages = with pkgs; [
+    # Hardware control (Pantheon itself ships Files/Terminal/Screenshot/
+    # notifications/dock/launcher — see services.desktopManager.pantheon
+    # in modules/desktop.nix, nothing to list here for those)
+    brightnessctl              # Backlight brightness (internal laptop panel)
+    ddcutil                    # DDC/CI brightness (external monitors)
+    lm_sensors                 # sensors-detect helps ddcutil find I2C buses; also feeds asusctl
+    networkmanager             # nmcli, for the Wi-Fi hotspot script
+
+    # Apps
+    blender
+    gimp
+    inkscape
+    vesktop
+    tor-browser
+    ffmpeg-full
+    vlc
+    filezilla
+    chromium
+
+    # Games
+    prismlauncher
+    pkgs.osu-lazer-bin
+
+    # Dev: compilers, runtimes, languages
+    glibc
+    musl
+    cmake
+    gnumake # Provides the 'make' command
+    gcc
+    python3
+    openjdk25
+    claude-code # AI Developer Assistant
+  ];
+
+  # Global command-line utilities available everywhere
+  environment.systemPackages = with pkgs; [
+    git
+    gh # GitHub CLI — was only installed ad-hoc before (login didn't survive)
+    vim
+    fastfetch
+    gparted
+    firejail
+    gnupg
+    lmstudio
+    p7zip
+    unzip
+    unrar
+    libreoffice # GTK3 build — matches Pantheon's native GTK theming, unlike the Qt build
+  ];
+}