feat: make VM and live ISO match an installed Nomarchy

- Migrate VM and graphical ISO to home-manager.nixosModules.home-manager;
  drop the standalone-HM sudo-based activation script (ran HM against
  /root because HOME wasn't reset) in flake.nix, core/system/vm-guest.nix,
  hosts/live-iso.nix.
- Run swaybg as nomarchy-wallpaper.service instead of a silent Hyprland
  exec-once so failures surface in systemctl.
- Skip the battery monitor unit on hosts without /sys/class/power_supply/BAT*
  (VMs, desktops).
- Don't wrap walker --dmenu in uwsm-app; redirect setsid background std-fds
  in nomarchy-launch-walker so $(menu ...) in nomarchy-menu doesn't hang.
- Restart waybar/walker via systemctl --user rather than pkill + uwsm-app
  to stop the post-theme-switch color race.
- Wire nomarchy-restart-walker/-waybar into nomarchy-theme-set so themes
  that only change the imported CSS reload correctly.
- Waybar: pin #custom-nomarchy to the Nomarchy font and use the U+F000
  codepoint so the logo shows across all themes.
- Auto-install the correct icon-theme package per palette via a new
  nomarchyLib.iconThemePackage helper in lib/default.nix; Everforest now
  actually renders for summer-night.
- Pre-cache every theme's HM generation: new packages.allThemeVariants
  flake output and nomarchy-themes-prebuild script so theme switches are
  cache-only (no Stylix rebuild, no downloads).
- Add nomarchy-test-live-iso to boot the graphical ISO in QEMU the same
  way nomarchy-test-vm does, with virtio-gpu support added to live-iso.nix.
- Installer-generated home.nix/system.nix now ship a curated, commented
  app menu (btop/fastfetch/chromium on by default) plus optional system
  services (Docker, libvirtd, Tailscale, Syncthing, Flatpak, Steam).
- nomarchy-test-vm now wipes the stale nomarchy.qcow2 before launch.
- Remove obsolete GEMINI.md and PLAN.md.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

features/desktop/hyprland/default.nix

@@ -50,4 +50,24 @@ in
   xdg.configFile."hypr/bindings.conf".source = lib.mkDefault ./config/bindings.conf;
   xdg.configFile."hypr/looknfeel.conf".source = lib.mkDefault ./config/looknfeel.conf;
   xdg.configFile."hypr/autostart.conf".source = lib.mkDefault ./config/autostart.conf;
+
+  # Run swaybg as a proper systemd user service rather than a Hyprland exec-once.
+  # exec-once fails silently (black screen with no visible error) when timing
+  # against uwsm's graphical-session target is off; a service surfaces failures
+  # via `systemctl --user status nomarchy-wallpaper` and auto-restarts.
+  systemd.user.services.nomarchy-wallpaper = {
+    Unit = {
+      Description = "Nomarchy desktop wallpaper (swaybg)";
+      PartOf = [ "graphical-session.target" ];
+      After = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart = "${pkgs.swaybg}/bin/swaybg -i %h/.config/nomarchy/current/background -m fill";
+      Restart = "on-failure";
+      RestartSec = "2";
+    };
+    Install = {
+      WantedBy = [ "graphical-session.target" ];
+    };
+  };
 }

features/desktop/scripts/nomarchy-restart-walker

@@ -1,11 +1,18 @@
 #!/bin/bash
 
+# Walker (with runAsService = true) and elephant are Home Manager user
+# services. Restart via systemd so the new process inherits the full graphical
+# session environment — the pkill/uwsm-app dance left a window where the
+# launcher would come back up with stale theming.
+
 restart_services() {
-  if systemctl --user is-enabled elephant.service &>/dev/null; then
+  if systemctl --user list-unit-files elephant.service >/dev/null 2>&1; then
     systemctl --user restart elephant.service
   fi
 
-  if systemctl --user is-enabled app-walker@autostart.service &>/dev/null; then
+  if systemctl --user list-unit-files walker.service >/dev/null 2>&1; then
+    systemctl --user restart walker.service
+  elif systemctl --user is-enabled app-walker@autostart.service &>/dev/null; then
     systemctl --user restart app-walker@autostart.service
   else
     echo -e "\e[31mUnable to restart Walker -- RESTART MANUALLY\e[0m"

features/desktop/scripts/nomarchy-restart-waybar

@@ -1,3 +1,14 @@
 #!/bin/bash
 
+# Waybar is provided as a Home Manager user service
+# (programs.waybar.systemd.enable = true), so the right way to restart it is
+# via systemd. `pkill + uwsm-app` races with HM's sd-switch on theme changes
+# and sometimes lands the new waybar without a full environment, producing
+# the "wrong colors after theme switch" symptom.
+
+if systemctl --user list-unit-files waybar.service >/dev/null 2>&1; then
+  exec systemctl --user restart waybar.service
+fi
+
+# Fallback for systems where waybar isn't managed by systemd.
 nomarchy-restart-app waybar

features/desktop/waybar/config/config.jsonc

@@ -40,7 +40,7 @@
     }
   },
   "custom/nomarchy": {
-    "format": "<span font='nomarchy'>a</span>",
+    "format": "",
     "on-click": "nomarchy-menu",
     "on-click-right": "xdg-terminal-exec",
     "tooltip-format": "Nomarchy Menu\n\nSuper + Alt + Space"

features/desktop/waybar/config/style.css

@@ -39,6 +39,14 @@
   margin: 0 7.5px;
 }
 
+/* The Nomarchy glyph lives at U+F000 in the dedicated "Nomarchy" font.
+   Nerd Fonts (used by default) also have U+F000 but render it as a glass
+   icon, so we have to pin the family for this module. */
+#custom-nomarchy {
+  font-family: Nomarchy;
+  font-size: 20px;
+}
+
 #tray {
   margin-right: 16px;
 }