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>

modules/home/hyprland.nix

@@ -0,0 +1,140 @@
+# Hyprland — fully driven by config.nomarchy.theme (theme-state.json).
+# Gaps, borders and colors are baked from the JSON at eval time; theme
+# changes arrive via `home-manager switch`.
+{ config, lib, ... }:
+
+let
+  t = config.nomarchy.theme;
+  c = t.colors;
+  inherit (config.nomarchy.lib) rgb rgba;
+
+  # SUPER+1..9 / SUPER+SHIFT+1..9 workspace binds, generated.
+  workspaceBinds = builtins.concatLists (builtins.genList
+    (i:
+      let ws = toString (i + 1);
+      in [
+        "$mod, ${ws}, workspace, ${ws}"
+        "$mod SHIFT, ${ws}, movetoworkspace, ${ws}"
+      ])
+    9);
+in
+{
+  wayland.windowManager.hyprland = lib.mkIf config.nomarchy.hyprland.enable {
+    enable = true;
+    # The binary and portal come from the NixOS module
+    # (programs.hyprland.enable); HM only manages configuration.
+    package = null;
+    portalPackage = null;
+
+    settings = {
+      "$mod" = "SUPER";
+      "$terminal" = config.nomarchy.terminal;
+
+      monitor = [ ",preferred,auto,1" ];
+
+      exec-once = [
+        "swww-daemon"
+        # Paint the wallpaper as soon as the session is up (waits for
+        # swww-daemon internally).
+        "nomarchy-theme-sync wallpaper"
+      ];
+
+      # ── Theme-driven look ──────────────────────────────────────────
+      general = {
+        gaps_in = t.ui.gapsIn;
+        gaps_out = t.ui.gapsOut;
+        border_size = t.ui.borderSize;
+        "col.active_border" = "${rgb c.accent} ${rgb c.accentAlt} 45deg";
+        "col.inactive_border" = rgb c.overlay;
+        layout = "dwindle";
+        resize_on_border = true;
+      };
+
+      decoration = {
+        rounding = t.ui.rounding;
+        active_opacity = t.ui.activeOpacity;
+        inactive_opacity = t.ui.inactiveOpacity;
+        blur = {
+          enabled = t.ui.blur;
+          size = 8;
+          passes = 2;
+          popups = true;
+        };
+        shadow = {
+          enabled = t.ui.shadow;
+          range = 20;
+          render_power = 3;
+          color = rgba c.mantle "aa";
+        };
+      };
+
+      animations = {
+        enabled = true;
+        bezier = [
+          "smooth, 0.25, 0.1, 0.25, 1.0"
+          "snappy, 0.6, 0.0, 0.1, 1.0"
+        ];
+        animation = [
+          "windows, 1, 4, snappy, popin 85%"
+          "border, 1, 8, smooth"
+          "fade, 1, 5, smooth"
+          "workspaces, 1, 4, snappy, slidefade 15%"
+        ];
+      };
+
+      # ── Behaviour ──────────────────────────────────────────────────
+      input = {
+        kb_layout = "us";
+        follow_mouse = 1;
+        touchpad.natural_scroll = true;
+      };
+
+      dwindle = {
+        pseudotile = true;
+        preserve_split = true;
+      };
+
+      misc = {
+        disable_hyprland_logo = true;
+        force_default_wallpaper = 0;
+      };
+
+      bind = [
+        "$mod, Return, exec, $terminal"
+        "$mod, D, exec, fuzzel"
+        "$mod, Q, killactive"
+        "$mod, F, fullscreen"
+        "$mod, V, togglefloating"
+        "$mod SHIFT, E, exit"
+
+        # Theme picker: fuzzel menu over the presets; apply writes the
+        # state and runs home-manager switch (progress via notify-send).
+        "$mod, T, exec, nomarchy-theme-sync apply \"$(nomarchy-theme-sync list | fuzzel --dmenu --prompt 'theme> ')\""
+        # Cycle the current theme's wallpapers (instant, no rebuild).
+        "$mod SHIFT, T, exec, nomarchy-theme-sync bg next"
+
+        # Focus
+        "$mod, H, movefocus, l"
+        "$mod, L, movefocus, r"
+        "$mod, K, movefocus, u"
+        "$mod, J, movefocus, d"
+
+        # Screenshot region to clipboard
+        ", Print, exec, grim -g \"$(slurp)\" - | wl-copy"
+      ] ++ workspaceBinds;
+
+      binde = [
+        ", XF86AudioRaiseVolume, exec, pamixer -i 5"
+        ", XF86AudioLowerVolume, exec, pamixer -d 5"
+        ", XF86AudioMute, exec, pamixer -t"
+        ", XF86MonBrightnessUp, exec, brightnessctl set +5%"
+        ", XF86MonBrightnessDown, exec, brightnessctl set 5%-"
+      ];
+
+      bindm = [
+        "$mod, mouse:272, movewindow"
+        "$mod, mouse:273, resizewindow"
+      ];
+    };
+  };
+}