refactor: cleanup configs, unify session handling

- flake.nix:
  - Close braces formatting for `allowUnfree`
  - Remove per-user `custom.sessionType` modules
- home-manager:
  - home.nix: remove unused apps (bambu-studio, hydralauncher, keymapp, etc.)
    - drop librespot service
    - add waydroid
    - fix kitty font_family spacing
  - gnome: add gnome-tweaks and appindicator extension
  - vim: update nixvim module import path
  - zsh: drop sessionType option and conditional aliases
    - hardcode wl-copy/wl-paste as pbcopy/pbpaste
- hyprland: style fixes in braces, spacing, keybind comments
- hosts/Nixstation:
  - remove gnome-session and redundant tweaks
  - remove env vars NIXOS_HOST / NIXOS_DE
  - enable virtualization (libvirtd, spiceUSBRedirection, vmware.host=false)
- hardware-configuration: reformat fileSystems definitions
- common/nvidia:
  - remove explicit kernelPackages override
  - ensure xserver.enable=true and GNOME/GDM config intact
- users/thiago: reorder and regroup extraGroups list

hosts/common/nvidia/default.nix

@@ -6,9 +6,8 @@
     #  ./passthrough.nix
   ];
   boot.kernelModules = [ "nvidia" ];
-  boot.kernelParams = ["nvidia-drm.modset=1"];
-  boot.blacklistedKernelModules = ["nouveau"];
-  boot.kernelPackages = pkgs.linuxPackages_6_12;
+  boot.kernelParams = [ "nvidia-drm.modset=1" ];
+  boot.blacklistedKernelModules = [ "nouveau" ];
   hardware = {
     graphics = {
       enable = true;
@@ -29,13 +28,14 @@
   };
 
   services = {
-   desktopManager.gnome.enable = true;
-   displayManager = {
+    services.xserver.enable = true;
+    desktopManager.gnome.enable = true;
+    displayManager = {
       gdm.enable = true;
       gdm.wayland = true;
       defaultSession = "gnome";
-   };
-   xserver.videoDrivers = [ "nvidia" ];
+    };
+    xserver.videoDrivers = [ "nvidia" ];
   };
 
   nixpkgs.config.cudaSupport = true;