Switch desktop environment from Hyprland to Budgie; app/audio overhaul

Hyprland problems prompted a full switch to Budgie (X11, lightdm).
Removes every Hyprland/Quickshell dotfile, theming script, and
hypr-specific module (theme.nix, the whole scripts/ theming pipeline,
hyprland.conf/hyprpaper.conf, the Quickshell shell QML, kitty/mako/
rofi configs) in favor of Budgie's own panel/session/theming and a
GSettings-driven icon/cursor override.

App changes:
- Konsole/Dolphin replace kitty/Thunar as the default terminal and
  file manager; dropped xterm too (services.xserver.excludePackages)
- Added Okular (PDF/document viewer), KCalc (calculator), Elisa
  (audio player) -- nothing filled those roles before
- Added OBS Studio

Audio/voice:
- EasyEffects for real-time mic/output effects (creates its own
  selectable "Easy Effects Source" virtual mic automatically)
- A standalone "Virtual Microphone" PipeWire device (loopback module,
  services.pipewire.extraConfig), fully independent of the real mic,
  for routing EasyEffects/Soundux output separately from what Discord
  etc. use by default
- qpwgraph for manual patchbay routing into the above
- Soundux (soundboard) installed via Flatpak -- no longer packaged in
  this nixpkgs channel

default-apps.nix: Okular wired into mimeapps.list alongside the
existing Gwenview/Ark defaults; removed the Thunar-specific
"Open Terminal Here" custom-action tmpfiles rule (dead now that
Thunar's gone -- Dolphin gets the same via its built-in konsolepart
terminal panel for free).

modules/scripts.nix

@@ -5,21 +5,6 @@ let
   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);
-  showDesktopToggle = pkgs.writeShellScriptBin "show-desktop-toggle" (builtins.readFile ./scripts/show-desktop-toggle.sh);
-  wallpaperSet = pkgs.writeShellScriptBin "wallpaper-set" (builtins.readFile ./scripts/wallpaper-set.sh);
-  wallpaperDelete = pkgs.writeShellScriptBin "wallpaper-delete" (builtins.readFile ./scripts/wallpaper-delete.sh);
-  wallpaperRestore = pkgs.writeShellScriptBin "wallpaper-restore" (builtins.readFile ./scripts/wallpaper-restore.sh);
-  wallpaperThumbs = pkgs.writeShellScriptBin "wallpaper-thumbs" (builtins.readFile ./scripts/wallpaper-thumbs.sh);
-  displaySet = pkgs.writeShellScriptBin "display-set" (builtins.readFile ./scripts/display-set.sh);
-  hyprThemeSet = pkgs.writeShellScriptBin "hypr-theme-set" (builtins.readFile ./scripts/hypr-theme-set.sh);
-  gtkThemeSet = pkgs.writeShellScriptBin "gtk-theme-set" (builtins.readFile ./scripts/gtk-theme-set.sh);
-  qtThemeSet = pkgs.writeShellScriptBin "qt-theme-set" (builtins.readFile ./scripts/qt-theme-set.sh);
-  kittyThemeSet = pkgs.writeShellScriptBin "kitty-theme-set" (builtins.readFile ./scripts/kitty-theme-set.sh);
-  rofiThemeSet = pkgs.writeShellScriptBin "rofi-theme-set" (builtins.readFile ./scripts/rofi-theme-set.sh);
-  listCursorThemes = pkgs.writeShellScriptBin "list-cursor-themes" (builtins.readFile ./scripts/list-cursor-themes.sh);
-  cursorPreviewAll = pkgs.writeShellScriptBin "cursor-preview-all" (builtins.readFile ./scripts/cursor-preview-all.sh);
-  cursorSet = pkgs.writeShellScriptBin "cursor-set" (builtins.readFile ./scripts/cursor-set.sh);
-  screenshot = pkgs.writeShellScriptBin "screenshot" (builtins.readFile ./scripts/screenshot.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);
@@ -33,23 +18,8 @@ in
     vaultToggle
     stripMetadata
     brightnessCtl
-    showDesktopToggle
-    wallpaperSet
-    wallpaperDelete
-    wallpaperRestore
-    wallpaperThumbs
-    displaySet
-    hyprThemeSet
-    gtkThemeSet
-    qtThemeSet
-    kittyThemeSet
-    rofiThemeSet
-    listCursorThemes
-    cursorPreviewAll
-    cursorSet
-    screenshot
     hotspotStart
     systemTelemetry
     weatherFetch
   ];
-}
+}