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

flake.nix

@@ -37,7 +37,8 @@
         Nixstation = nixpkgs.lib.nixosSystem {
           specialArgs = {
             inherit inputs outputs;
-            allowUnfree = true;};
+            allowUnfree = true;
+          };
           modules = [
             ./hosts/Nixstation
           ];
@@ -52,7 +53,6 @@
           };
           modules = [
             ./home-manager/home.nix
-            { custom.sessionType = "wayland"; }
           ];
         };
         "thiago@Nixstation" = home-manager.lib.homeManagerConfiguration {
@@ -63,7 +63,6 @@
 
           modules = [
             ./home-manager/home.nix
-            { custom.sessionType = "wayland"; }
           ];
         };
       };