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/hardware-configuration.nix

@@ -26,22 +26,25 @@
     extraModulePackages = [ ];
   };
 
-fileSystems."/" =
-  { device = "/dev/disk/by-uuid/07c4d31f-e1cd-4a02-8b3f-8c2bd2e0ce8d";
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/07c4d31f-e1cd-4a02-8b3f-8c2bd2e0ce8d";
     fsType = "btrfs";
     options = [ "subvol=@" ];
   };
 
-fileSystems."/home" =
-  { device = "/dev/disk/by-uuid/07c4d31f-e1cd-4a02-8b3f-8c2bd2e0ce8d";
+  fileSystems."/home" = {
+    device = "/dev/disk/by-uuid/07c4d31f-e1cd-4a02-8b3f-8c2bd2e0ce8d";
     fsType = "btrfs";
     options = [ "subvol=@home" ];
   };
 
-fileSystems."/boot" =
-  { device = "/dev/disk/by-uuid/D2EA-469F";
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/D2EA-469F";
     fsType = "vfat";
-    options = [ "fmask=0077" "dmask=0077" ];
+    options = [
+      "fmask=0077"
+      "dmask=0077"
+    ];
   };
 
   swapDevices = [ ];