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-day/btop.theme

@@ -0,0 +1,86 @@
+# Main background, empty for terminal default, need to be empty if you want transparent background
+theme[main_bg]="#fdf6e3"
+
+# Main text color
+theme[main_fg]="#5c6a72"
+
+# Title color for boxes
+theme[title]="#5c6a72"
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#f85552"
+
+# Background color of selected items
+theme[selected_bg]="#e6e2cc"
+
+# Foreground color of selected items
+theme[selected_fg]="#dfa000"
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#bdc3af"
+
+# Color of text appearing on top of graphs, i.e uptime and current network graph scaling
+theme[graph_text]="#5c6a72"
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#8da101"
+
+# Cpu box outline color
+theme[cpu_box]="#bdc3af"
+
+# Memory/disks box outline color
+theme[mem_box]="#bdc3af"
+
+# Net up/down box outline color
+theme[net_box]="#bdc3af"
+
+# Processes box outline color
+theme[proc_box]="#bdc3af"
+
+# Box divider line and small boxes line color
+theme[div_line]="#bdc3af"
+
+# Temperature graph colors
+theme[temp_start]="#8da101"
+theme[temp_mid]="#dfa000"
+theme[temp_end]="#f85552"
+
+# CPU graph colors
+theme[cpu_start]="#8da101"
+theme[cpu_mid]="#dfa000"
+theme[cpu_end]="#f85552"
+
+# Mem/Disk free meter
+theme[free_start]="#f85552"
+theme[free_mid]="#dfa000"
+theme[free_end]="#8da101"
+
+# Mem/Disk cached meter
+theme[cached_start]="#3a94c5"
+theme[cached_mid]="#35a77c"
+theme[cached_end]="#8da101"
+
+# Mem/Disk available meter
+theme[available_start]="#f85552"
+theme[available_mid]="#dfa000"
+theme[available_end]="#8da101"
+
+# Mem/Disk used meter
+theme[used_start]="#8da101"
+theme[used_mid]="#dfa000"
+theme[used_end]="#f85552"
+
+# Download graph colors
+theme[download_start]="#8da101"
+theme[download_mid]="#35a77c"
+theme[download_end]="#3a94c5"
+
+# Upload graph colors
+theme[upload_start]="#dfa000"
+theme[upload_mid]="#df69ba"
+theme[upload_end]="#f85552"
+
+# Process box color gradient for threads, mem and cpu usage
+theme[process_start]="#8da101"
+theme[process_mid]="#f85552"
+theme[process_end]="#f85552"

themes/summer-day/waybar.css

@@ -0,0 +1,102 @@
+@define-color bg_dim #efebd4;
+@define-color bg0 #fdf6e3;
+@define-color bg1 #f4f0d9;
+@define-color bg2 #efebd4;
+@define-color bg3 #e6e2cc;
+@define-color bg4 #e0dcc7;
+@define-color bg5 #bdc3af;
+@define-color fg #5c6a72;
+@define-color red #f85552;
+@define-color orange #f57d26;
+@define-color yellow #dfa000;
+@define-color green #8da101;
+@define-color aqua #35a77c;
+@define-color blue #3a94c5;
+@define-color purple #df69ba;
+@define-color grey0 #a6b0a0;
+@define-color grey1 #939f91;
+@define-color grey2 #829181;
+
+/* 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: 16px;
+  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: #3d4a52;
+  border-bottom-style: solid;
+}
+
+#custom-launcher,
+#clock,
+#clock-date,
+#workspaces,
+#pulseaudio,
+#network,
+#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: @bg5;
+  border-bottom-style: solid;
+}
+
+#workspaces {
+  padding: 0px;
+}
+
+#workspaces button.active {
+  background-color: @blue;
+  color: @bg0;
+
+	border-radius: 10px;
+
+  margin-bottom: -5px;
+
+  border-bottom-width: 5px;
+  border-bottom-color: #1e6791;
+  border-bottom-style: solid;
+}
+
+#custom-launcher {
+  background-color: @green;
+  color: @bg0;
+  border-bottom-color: #5d6b00;
+
+  margin-left: 15px;
+  padding-left: 20px;
+  padding-right: 21px;
+}
+
+#custom-powermenu {
+  background-color: @red;
+  color: @bg0;
+  border-bottom-color: #b32f2c;
+
+  margin-right: 15px;
+  padding-left: 20px;
+  padding-right: 23px;
+}