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