refactor: major architectural restructure for theme-centric organization

Theme System:
- Move all theme app configs to apps/ subdirectory (20 themes)
- Add theme-loader.nix for dynamic theme config deployment
- Simplify stylix.nix to focus on base theming only

Override System:
- Add overrides.nix for file-based config overrides
- Add behavior-configs.nix for non-visual configuration
- Split hypr/nomarchy.conf into behavior vs visual sections

Module Improvements:
- Add lib.mkDefault to all customizable settings
- Add modules/lib/ with shared utilities and state schema
- Update all home and system modules for downstream overridability

Installer:
- New minimal TTY installer (installer/install.sh)
- Golden path: BTRFS + LUKS2 (disko-golden.nix)
- New installer-iso.nix for TTY-only installation
- Keep graphical installer as installerIsoGraphical option

Cleanup:
- Remove obsolete install.sh, disko-ext4.nix, install-nomarchy.sh
- Update live-iso.nix references
- Add .claude/ to .gitignore for local IDE settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

modules/home/state.nix

@@ -1,24 +1,11 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, ... }:
 
 let
-  stateDir = "${config.home.homeDirectory}/.config/home-manager";
-  
-  # Helper to read state from a file, with a default
-  readState = file: default:
-    if builtins.pathExists "${stateDir}/${file}" then
-      let 
-        content = builtins.readFile "${stateDir}/${file}";
-        cleanContent = lib.removeSuffix "\n" content;
-      in
-      if lib.hasSuffix ".json" file then
-        builtins.fromJSON cleanContent
-      else
-        cleanContent
-    else
-      default;
+  nomarchyLib = import ../lib { inherit lib; };
+  assetsPath = ../../assets/themes;
 
-  # Unified state reading
-  togglesState = readState "state.json" {};
+  # Read unified state from ~/.config/nomarchy/state.json
+  togglesState = nomarchyLib.readHomeState config.home.homeDirectory;
 in
 {
   config = {
@@ -40,15 +27,16 @@ in
         border_size = togglesState.hyprland.border_size or 2;
       };
       fonts.monospace = togglesState.font or "JetBrainsMono Nerd Font";
-      
+
       # Derived properties from the theme directory
-      isLightMode = builtins.pathExists (../../assets/themes + "/${togglesState.theme or "nord"}/light.mode");
-      iconsTheme = let
-        iconsFile = ../../assets/themes + "/${togglesState.theme or "nord"}/icons.theme";
-      in
-        if builtins.pathExists iconsFile 
-        then lib.removeSuffix "\n" (builtins.readFile iconsFile)
-        else "Yaru-blue";
+      isLightMode = nomarchyLib.isThemeLightMode {
+        themeName = togglesState.theme or "nord";
+        inherit assetsPath;
+      };
+      iconsTheme = nomarchyLib.getIconsTheme {
+        themeName = togglesState.theme or "nord";
+        inherit assetsPath;
+      };
     };
   };
 }