feat: Nomarchy ground-up rewrite on NixOS 26.05

Full replacement of the previous iteration, rebuilt around three ideas:

- Pure evaluation: theme-state.json lives inside the flake and is read
  via the nomarchy.stateFile option — no --impure, ever.
- All-Home-Manager theming: `nomarchy-theme-sync apply` writes the JSON
  and runs `home-manager switch`; every theme change is one atomic,
  rollbackable generation. Wallpaper (swww) is the sole runtime piece.
- Flat, downstream-first layout: modules/{nixos,home} with one
  options.nix each, exported as nixosModules/homeModules + overlay +
  flake template; system (nixos-rebuild) and desktop (home-manager
  switch) rebuild paths are fully split.

Ships 21 themes imported from the previous iteration (palettes,
wallpapers, btop themes, six whole-swap Waybar identities), Stylix for
the GTK/Qt/cursor long tail, a live ISO target with offline theme
switching, and docs/TESTING.md with the QEMU verification workflow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

themes/summer-night/waybar.css

@@ -0,0 +1,123 @@
+@define-color bg_dim #232a2e;
+@define-color bg0 #2d353b;
+@define-color bg1 #343f44;
+@define-color bg2 #3d484d;
+@define-color bg3 #475258;
+@define-color bg4 #4f585e;
+@define-color bg5 #56635f;
+@define-color bg_visual #543a48;
+@define-color bg_red #514045;
+@define-color bg_green #425047;
+@define-color bg_blue #3a515d;
+@define-color bg_yellow #4d4c43;
+@define-color fg #d3c6aa;
+@define-color red #e67e80;
+@define-color orange #e69875;
+@define-color yellow #dbbc7f;
+@define-color green #a7c080;
+@define-color aqua #83c092;
+@define-color blue #7fbbb3;
+@define-color purple #d699b6;
+@define-color grey0 #7a8478;
+@define-color grey1 #859289;
+@define-color grey2 #9da9a0;
+/* margin: top right bottom left */
+/* Spacing outside the element */
+
+/* padding: top right bottom left */
+/* Spacing inside the element */
+
+* {
+  font-family: JetBrainsMono Nerd Font, FontAwesome;
+  font-size: 13px;
+  font-weight: bold;
+}
+
+window#waybar {
+  background-color: @fg;
+  color: @bg0;
+  transition-property: background-color;
+  transition-duration: 0.5s;
+  border-radius: 0px 0px 15px 15px;
+  transition-duration: .5s;
+
+  border-bottom-width: 5px;
+  border-bottom-color: #7d6a40;
+  border-bottom-style: solid;
+}
+
+#backlight,
+#tray,
+#custom-nomarchy,
+#clock,
+#clock.date,
+#workspaces,
+#pulseaudio,
+#idle_inhibitor,
+#custom-battery,
+#custom-powermenu {
+  background-color: @bg0;
+  color: @fg;
+  padding-left: 10px;
+  padding-right: 10px;
+  margin-top: 7px;
+  margin-bottom: 12px;
+  border-radius: 10px;
+  border-bottom-width: 5px;
+  border-bottom-color: #161a1d;
+  border-bottom-style: solid;
+}
+
+#tray > .active {
+    color: @fg;
+}
+
+#tray > .needs-attention {
+    color: @green;
+}
+
+#workspaces {
+  padding: 0px;
+}
+
+#workspaces button.active {
+  background-color: @blue;
+  color: @bg0;
+  border-radius: 10px;
+  margin-bottom: -5px;
+  border-bottom-width: 5px;
+  border-bottom-color: #366660;
+  border-bottom-style: solid;
+}
+
+#custom-nomarchy {
+  background-color: @green;
+  color: @bg0;
+  border-bottom-color: #556a35;
+
+  margin-left: 15px;
+  padding-left: 20px;
+  padding-right: 21px;
+  font-family: Nomarchy;
+  font-size: 20px;
+}
+
+#custom-powermenu {
+  background-color: @red;
+  color: @bg0;
+  border-bottom-color: #951c1f;
+
+  margin-right: 15px;
+  padding-left: 20px;
+  padding-right: 23px;
+}
+
+#custom-battery.preservation {
+  color: @green;
+}
+
+#idle_inhibitor {
+    padding-left: 10px;
+    padding-right: 10px;
+    font-size: 20px;
+}