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/default.nix

@@ -55,7 +55,7 @@
   programs.zsh.enable = true;
   services = {
     pcscd.enable = true;
-    # xserver.displayManager.sessionCommands = 
+    # xserver.displayManager.sessionCommands =
     #   "${pkgs.xorg.xmodmap}/bin/xmodmap -e 'keycode 64 = Alt_L'";
 
   };

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;

hosts/common/users/thiago/default.nix

@@ -7,25 +7,24 @@ in
 
     isNormalUser = true;
     initialPassword = "changeme";
-    extraGroups =
-      [
-        "fuse"
-        "networkmanager"
-        "wheel"
-        "scard"
-      ]
-      ++ ifTheyExist [
-        "wireshark"
-        "i2c"
-        "docker"
-        "git"
-        "libvirtd"
-        "libvirt"
-        "video"
-        "kvm"
-        "scanner"
-        "photos"
-      ];
+    extraGroups = [
+      "fuse"
+      "networkmanager"
+      "scard"
+      "wheel"
+    ]
+    ++ ifTheyExist [
+      "docker"
+      "git"
+      "i2c"
+      "kvm"
+      "libvirt"
+      "libvirtd"
+      "photos"
+      "scanner"
+      "video"
+      "wireshark"
+    ];
     openssh.authorizedKeys.keyFiles = [
       (builtins.fetchurl {
         url = "https://github.com/sposito.keys";