refactor(desktop): clean up options formatting and simplify slice logic

Refactor `modules/desktop/options.nix` to improve code readability by
expanding the `optPath` list definition and simplifying the
`wisdomSimpleSlice` configuration logic.

Also apply minor style fixes to `modules/wisdom/filebrowsers/nemo.nix`
to ensure consistent spacing within list definitions.

modules/desktop/options.nix

@@ -1,8 +1,5 @@
-{ lib, ... }: {
-  # Resolve `wisdom*` HM slices for NixOS `extraModules` (`self` is not an HM specialArg).
-  # Slices are gated by `chiasson.home.*.enable`; hosts only flip toggles in `home.nix`.
-  # Lives here (not `modules/lib/`) because `hosts/desktop-home-base.nix` consumes it and
-  # fragment eval order requires the definition to sort before `hosts/`.
+{ lib, ... }:
+{
   flake.lib.wisdomCatalogExtraModules =
     self:
     let
@@ -14,22 +11,24 @@
     in
     map (name: self.homeManagerModules.${name}) names;
 
-  # Thin HM slice: an `enable` toggle that adds packages to `home.packages`, skipping
-  # any not `availableOn` this platform. `packages` is a `pkgs -> [ drv ]` function so
-  # callers only name each package once (the helper owns the platform-gating). Used by
-  # the trivial single-package wisdom slices so they stay one declarative block instead
-  # of the repeated `root/cfg` + `mkIf (root.enable && cfg.enable)` boilerplate.
   flake.lib.wisdomSimpleSlice =
     { path, default, description, packages }:
     { config, lib, pkgs, ... }:
     let
       segs = lib.splitString "." path;
-      optPath = [ "chiasson" "home" ] ++ segs ++ [ "enable" ];
+      optPath = [
+        "chiasson"
+        "home"
+      ]
+      ++ segs
+      ++ [ "enable" ];
+      root = config.chiasson.home;
+      cfg = lib.getAttrFromPath segs root;
       enabled = lib.getAttrFromPath optPath config;
     in
     {
       options = lib.setAttrByPath optPath (lib.mkEnableOption description // { inherit default; });
-      config = lib.mkIf (config.chiasson.home.enable && enabled) {
+      config = lib.mkIf (root.enable && enabled) {
         home.packages = lib.filter (lib.meta.availableOn pkgs.stdenv.hostPlatform) (packages pkgs);
       };
     };