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/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";