chore: System updates and config tweaks

Updated all flake inputs and applied srveral improvements to the
system configurations.

*** Updates
- Ran =flake update= to bring all dependencies to their latest
  versions.
- Pinned =lix-module= to the stable =release-2.93= branch to
  prevent breakages from its main branch.

*** System Configuration
- ssh: Reworked the client configuration to use a global =*= match
  block for secure defaults. Disabled the default home-manager
  config for removing nixpkgs' wrannings.
- intel-vaapi-driver: Enabled =enableHybridCodec= override to avoid
  to build whole package from scratch.
- kde: Forced the Qt platform theme to =kde= to fix a visual bug
  with Stylix.
- onnxruntime: Disabled CUDA/NCCL support to avoid to build the
  whole package from scratch.

*** Application Changes
- firefox: Switched the default browser package to =firefox-beta=
  across the entire configuration (NixOS, home-manager, and niri).
- editor: Removed =hurl= and =cmake-language-server= from the
  editor runtime environment for broken packages.

home/david/modules/programs/firefox.nix

@@ -19,6 +19,7 @@ in
     ];
     programs.firefox = {
       enable = true;
+      package = pkgs.firefox-beta;
       betterfox = {
         enable = true;
       };