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/system/browser.nix

@@ -1,22 +1,30 @@
 { config, pkgs, lib, ... }:
 
 let
-  palettes = import ../../assets/themes/nomarchy-palettes.nix;
+  nomarchyLib = import ../lib { inherit lib; };
   activeThemeName = config.nomarchy.system.theme;
-  currentPalette = (palettes.${activeThemeName} or palettes.nord).palette;
-  
+  currentPalette = nomarchyLib.getPalette activeThemeName;
+
   # Hex color for browser theme (base00 is background)
   themeColor = "#${currentPalette.base00}";
-  
-  policy = {
+
+  # Detect light mode from theme name or palette
+  isLightTheme = nomarchyLib.isThemeLightMode {
+    themeName = activeThemeName;
+    assetsPath = ../../assets/themes;
+  };
+
+  browserPolicy = {
     BrowserThemeColor = themeColor;
-    BrowserColorScheme = if lib.strings.hasInfix "light" activeThemeName then "light" else "dark";
+    BrowserColorScheme = if isLightTheme then "light" else "dark";
   };
 in
 {
   # Chromium policies
-  programs.chromium.extraOpts = policy;
-  
-  # Brave policies (Brave on NixOS also respects some chromium policies if set via extraOpts)
-  # But better to use the specific brave module if available or just the same policy.
+  programs.chromium.extraOpts = lib.mkDefault browserPolicy;
+
+  # Brave browser policies via managed policy file
+  environment.etc."brave/policies/managed/nomarchy.json".text = lib.mkDefault (
+    builtins.toJSON browserPolicy
+  );
 }