feat(wisdom): introduce wisdomSimpleSlice helper for package modules

Implement a `wisdomSimpleSlice` helper in `desktop/options.nix` to reduce
boilerplate for simple Home Manager modules that only manage packages.
This helper handles the `enable` option creation, platform-gating via
`availableOn`, and conditional inclusion in `home.packages`.

Refactor several existing wisdom modules to use this new helper:
- `wisdomBrowsersChrome`
- `wisdomBrowsersEdge`
- `wisdomEditorsKate`
- `wisdomEditorsObsidian`

Additionally, clean up `wisdom/default.nix` by removing the explicit
import of `wisdomShellBash` (which is now handled via auto-wiring) and
improving code formatting.

modules/desktop/options.nix

@@ -7,13 +7,33 @@
     self:
     let
       names = lib.sort builtins.lessThan (
-        lib.filter (n: lib.hasPrefix "wisdom" n && n != "wisdom" && n != "wisdomShellBash") (
+        lib.filter (n: lib.hasPrefix "wisdom" n && n != "wisdom") (
           builtins.attrNames self.homeManagerModules
         )
       );
     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" ];
+      enabled = lib.getAttrFromPath optPath config;
+    in
+    {
+      options = lib.setAttrByPath optPath (lib.mkEnableOption description // { inherit default; });
+      config = lib.mkIf (config.chiasson.home.enable && enabled) {
+        home.packages = lib.filter (lib.meta.availableOn pkgs.stdenv.hostPlatform) (packages pkgs);
+      };
+    };
+
   flake.nixosModules.desktopOptions =
     { config, options, lib, pkgs, self, inputs, ... }:
     let