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/catppuccin-latte/btop.theme

@@ -0,0 +1,84 @@
+# https://github.com/catppuccin/btop/blob/main/themes/catppuccin_latte.theme
+# Main background, empty for terminal default, need to be empty if you want transparent background
+theme[main_bg]="#eff1f5"
+
+# Main text color
+theme[main_fg]="#4c4f69"
+
+# Title color for boxes
+theme[title]="#4c4f69"
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#1e66f5"
+
+# Background color of selected item in processes box
+theme[selected_bg]="#bcc0cc"
+
+# Foreground color of selected item in processes box
+theme[selected_fg]="#1e66f5"
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#8c8fa1"
+
+# Color of text appearing on top of graphs, i.e uptime and current network graph scaling
+theme[graph_text]="#dc8a78"
+
+# Background color of the percentage meters
+theme[meter_bg]="#bcc0cc"
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#dc8a78"
+
+# CPU, Memory, Network, Proc box outline colors
+theme[cpu_box]="#8839ef" #Mauve
+theme[mem_box]="#40a02b" #Green
+theme[net_box]="#e64553" #Maroon
+theme[proc_box]="#1e66f5" #Blue
+
+# Box divider line and small boxes line color
+theme[div_line]="#9ca0b0"
+
+# Temperature graph color (Green -> Yellow -> Red)
+theme[temp_start]="#40a02b"
+theme[temp_mid]="#df8e1d"
+theme[temp_end]="#d20f39"
+
+# CPU graph colors (Teal -> Lavender)
+theme[cpu_start]="#179299"
+theme[cpu_mid]="#209fb5"
+theme[cpu_end]="#7287fd"
+
+# Mem/Disk free meter (Mauve -> Lavender -> Blue)
+theme[free_start]="#8839ef"
+theme[free_mid]="#7287fd"
+theme[free_end]="#1e66f5"
+
+# Mem/Disk cached meter (Sapphire -> Lavender)
+theme[cached_start]="#209fb5"
+theme[cached_mid]="#1e66f5"
+theme[cached_end]="#7287fd"
+
+# Mem/Disk available meter (Peach -> Red)
+theme[available_start]="#fe640b"
+theme[available_mid]="#e64553"
+theme[available_end]="#d20f39"
+
+# Mem/Disk used meter (Green -> Sky)
+theme[used_start]="#40a02b"
+theme[used_mid]="#179299"
+theme[used_end]="#04a5e5"
+
+# Download graph colors (Peach -> Red)
+theme[download_start]="#fe640b"
+theme[download_mid]="#e64553"
+theme[download_end]="#d20f39"
+
+# Upload graph colors (Green -> Sky)
+theme[upload_start]="#40a02b"
+theme[upload_mid]="#179299"
+theme[upload_end]="#04a5e5"
+
+# Process box color gradient for threads, mem and cpu usage (Sapphire -> Mauve)
+theme[process_start]="#209fb5"
+theme[process_mid]="#7287fd"
+theme[process_end]="#8839ef"