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/Nixstation/default.nix

@@ -12,7 +12,9 @@
   boot = {
     loader.systemd-boot.enable = true;
     loader.efi.canTouchEfiVariables = true;
+    # kernelPackages = pkgs.linuxPackages_6_16;
   };
+
   environment = {
     systemPackages = with pkgs; [
       act
@@ -21,16 +23,9 @@
       networkmanagerapplet
       libwacom
       wacomtablet
-      gnome-tweaks
-      gnome-session
     ];
-
-    variables = {
-      NIXOS_HOST = "nixstation";
-      NIXOS_DE = "wayland";
-    };
   };
-  
+
   hardware = {
     sane.enable = true;
     graphics.enable = true;
@@ -144,15 +139,15 @@
   };
   system.stateVersion = "25.11"; # keep it!
   time.timeZone = "America/Sao_Paulo";
-  # virtualisation = {
-  #   vmware.host.enable = false;
-  #   spiceUSBRedirection.enable = true;
-  #   libvirtd = {
-  #     enable = true;
-  #     qemu.ovmf.enable = true;
-  #     # qemu.package = pkgs.qemu_full;
-  #   };
-  # };
+  virtualisation = {
+    vmware.host.enable = false;
+    spiceUSBRedirection.enable = true;
+    libvirtd = {
+      enable = true;
+      qemu.ovmf.enable = true;
+      # qemu.package = pkgs.qemu_full;
+    };
+  };
 
   zramSwap = {
     enable = true;