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/stylix.nix

@@ -1,37 +1,57 @@
 { config, pkgs, inputs, lib, ... }:
 
-let
-  # Re-use our state-based logic
-  palettes = import ../../assets/themes/nomarchy-palettes.nix;
-  
-  activeThemeName = config.nomarchy.theme;
-  activeWallpaper = if config.nomarchy.wallpaper != "" then 
-    # Use the absolute path from the state file (string format to avoid Nix Store copy)
-    config.nomarchy.wallpaper 
-  else ../../assets/themes/catppuccin/backgrounds/1-totoro.png; # Fallback path object (copied to store)
+# Stylix Integration Module
+#
+# This module handles base-level theming through Stylix:
+# - Color scheme injection from the active theme's palette
+# - Cursor configuration
+# - Font configuration
+# - GTK/GNOME theming
+#
+# App-specific theming is handled separately:
+# - theme-loader.nix: Deploys theme's apps/ configs (btop, neovim, etc.)
+# - waybar.nix: Generates waybar CSS from colorScheme
+# - hyprland.nix: Handles hyprland border colors
+#
+# Stylix targets disabled here (we have custom implementations):
+# - hyprland: Custom border/rule config
+# - waybar: Custom CSS with theme colors
 
-  # Map nix-colors palette to a format Stylix expects (attrset of hex strings)
-  currentPalette = (palettes.${activeThemeName} or palettes.nord).palette;
+let
+  nomarchyLib = import ../lib { inherit lib; };
+  assetsPath = ../../assets/themes;
+
+  activeThemeName = config.nomarchy.theme;
+
+  # Use shared wallpaper resolver
+  activeWallpaper = nomarchyLib.resolveWallpaper {
+    wallpaperPath = config.nomarchy.wallpaper;
+    themeName = activeThemeName;
+    inherit assetsPath;
+  };
+
+  # Get palette using shared library
+  currentPalette = nomarchyLib.getPalette activeThemeName;
 in
 {
   imports = [ inputs.stylix.homeModules.stylix ];
 
   stylix = {
-    enable = true;
-    enableReleaseChecks = false;
-    image = activeWallpaper;
-    base16Scheme = currentPalette;
-    
-    # Use detected light mode state
-    polarity = if config.nomarchy.isLightMode then "light" else "dark";
+    enable = lib.mkDefault true;
+    enableReleaseChecks = lib.mkDefault false;
+    image = lib.mkDefault activeWallpaper;
+    base16Scheme = lib.mkDefault currentPalette;
 
-    cursor = {
+    # Use detected light mode state
+    polarity = lib.mkDefault (if config.nomarchy.isLightMode then "light" else "dark");
+
+    cursor = lib.mkDefault {
       package = config.nomarchy.cursor.package;
       name = config.nomarchy.cursor.name;
       size = 24;
     };
 
-    fonts = {
+    fonts = lib.mkDefault {
       monospace = {
         package = pkgs.nerd-fonts.jetbrains-mono;
         name = config.nomarchy.fonts.monospace;
@@ -57,7 +77,7 @@ in
     };
 
     # Enable theming for specific targets
-    targets = {
+    targets = lib.mkDefault {
       hyprland.enable = false; # We keep our custom hyprland config for borders/rules
       waybar.enable = false;   # We keep our custom waybar CSS
       alacritty.enable = true;
@@ -69,8 +89,8 @@ in
 
   # GTK Icon Theme configuration
   gtk = {
-    enable = true;
-    iconTheme = {
+    enable = lib.mkDefault true;
+    iconTheme = lib.mkDefault {
       package = pkgs.yaru-theme;
       name = config.nomarchy.iconsTheme;
     };