feat(home): package Claude Desktop and T3 Code, with per-host UI scaling

Add two Electron AI desktop apps built from their official upstream
binaries and wire them into the home config (x86_64 only):

- claude-desktop: Anthropic's official Linux .deb, unpacked via dpkg +
  autoPatchelfHook. Wrapper disables the SUID sandbox (nix store can't
  set it up) and adds the NixOS GL driver path so it hardware-accelerates
  instead of falling back to software rendering.
- t3-code: pingdotgg/t3code AppImage via appimageTools.wrapType2, with
  desktop entry + hicolor icons.

Both share a new custom.aiApps.deviceScaleFactor option feeding
--force-device-scale-factor; konishi's 4K@1x monitors set it to "1.5",
arrakis stays native.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

home/konishi/default.nix

@@ -35,6 +35,9 @@
     retroarch = true;
   };
 
+  # 4K@1x monitors render the Electron AI apps tiny; scale their UI up. Tune to taste.
+  custom.aiApps.deviceScaleFactor = "1.5";
+
   wayland.windowManager.hyprland.settings = {
     exec-once = [
       # boot-into-lock: paired with SDDM autologin (host config), lock the