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/scripts.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+
+let
+  # Wrap external shell scripts into system executables
+  vaultToggle = pkgs.writeShellScriptBin "vault-toggle" (builtins.readFile ./scripts/vault-toggle.sh);
+  stripMetadata = pkgs.writeShellScriptBin "strip-metadata" (builtins.readFile ./scripts/strip-metadata.sh);
+  brightnessCtl = pkgs.writeShellScriptBin "brightness-ctl" (builtins.readFile ./scripts/brightness-ctl.sh);
+  hotspotStart = pkgs.writeShellScriptBin "hotspot-start" (builtins.readFile ./scripts/hotspot-start.sh);
+  systemTelemetry = pkgs.writeShellScriptBin "system-telemetry" (builtins.readFile ./scripts/system-telemetry.sh);
+  weatherFetch = pkgs.writeShellScriptBin "weather-fetch" (builtins.readFile ./scripts/weather-fetch.sh);
+in
+{
+  # Install CLI dependencies required by the scripts
+  environment.systemPackages = with pkgs; [
+    gocryptfs
+    exiftool
+    jq
+    vaultToggle
+    stripMetadata
+    brightnessCtl
+    hotspotStart
+    systemTelemetry
+    weatherFetch
+  ];
+}