fix(home): drop mkDefault on home.packages — it discarded the whole app list

Chasing a "DBus.Error … name is not activatable" from notify-send (mako),
the root cause turned out to be far bigger: home.packages in
features/default.nix was wrapped in lib.mkDefault. home.packages is a
list, and the module system's filterOverrides keeps only the
highest-priority definitions — so the moment any other module sets
home.packages at normal priority (features/scripts/default.nix's
`[ nomarchy-scripts ]`, the installer's profile packages), this entire
mkDefault list was DROPPED. Every install was silently missing firefox,
thunar, imv, mpv, swww, mako, hyprlock, rofi, etc. — which broke
notifications (mako never installed → exec-once fails → notify-send dead)
and the lock screen (hyprlock missing), and hid a stale `rofi-wayland`
reference (merged into `rofi` upstream) that only errored once the list
was live again. Remove the mkDefault so the list merges (home.packages =
52 pkgs, up from 31; mako/hyprlock/firefox/… now present) and fix
rofi-wayland -> rofi.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

features/default.nix

@@ -38,7 +38,12 @@ in
   # Enable neovim program module (required for stylix integration)
   programs.neovim.enable = lib.mkDefault true;
 
-  home.packages = lib.mkDefault (with pkgs; [
+  # NOT mkDefault: home.packages is a list that MERGES across modules. At
+  # mkDefault priority this whole curated list is dropped the moment any
+  # other module sets home.packages at normal priority (features/scripts,
+  # the installer's profile packages), silently removing firefox, mako,
+  # hyprlock, mpv, etc. — which broke notifications and the lock screen.
+  home.packages = (with pkgs; [
     # Core applications
     firefox
     xfce.thunar
@@ -69,7 +74,7 @@ in
     gum              # TUI components for scripts
     xdg-terminal-exec
     swaybg
-    rofi-wayland
+    rofi   # rofi-wayland was merged into rofi upstream
 
     # Theming — cursor package stays here; icon theme packages are pulled in
     # dynamically by themes/engine/stylix.nix via nomarchyLib.iconThemePackage
@@ -77,3 +82,4 @@ in
     bibata-cursors
   ]);
 }
+