Add Limine bootloader support with themed styling

Phase 2: Bootloader improvements

- Add bootloader choice: systemd-boot (default) or Limine
- Configure Limine with classical theme colors:
  - Dark brown background (#1a1611)
  - Tan text (#d4c4a8)
  - Gold accents (#d4a857)
- Add Plymouth boot splash option
- Update installer to prompt for bootloader choice
- Add example-limine configuration
- Update documentation with boot options

Users can now choose between:
1. systemd-boot - Simple, reliable, well-tested (default)
2. Limine - Modern, prettier, themed to match Nomarchy

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

modules/core/boot.nix

@@ -1,5 +1,5 @@
 # Boot configuration
-# Supports both systemd-boot (default) and Limine
+# Supports systemd-boot (default) and Limine (optional)
 {
   config,
   lib,
@@ -7,19 +7,94 @@
   nomarchyConfig,
   ...
 }: let
-  # For ISO builds, we'll use Limine; for regular installs, systemd-boot
-  useSystemdBoot = nomarchyConfig.bootloader or "systemd-boot" == "systemd-boot";
+  bootloader = nomarchyConfig.bootloader or "systemd-boot";
+  useLimine = bootloader == "limine";
+  useSystemdBoot = bootloader == "systemd-boot";
+
+  # Theme colors for Limine
+  theme = config.nomarchy.theme or (import ../../themes/classical/colors.nix);
 in {
-  # Systemd-boot (default for NixOS installs)
+  # Systemd-boot (default - simpler, well-tested)
   boot.loader.systemd-boot = lib.mkIf useSystemdBoot {
     enable = true;
     configurationLimit = 10;
+    editor = false; # Disable editor for security
   };
 
-  boot.loader.efi.canTouchEfiVariables = useSystemdBoot;
+  # EFI variables - needed for both bootloaders
+  boot.loader.efi.canTouchEfiVariables = true;
 
-  # Limine support (for ISO)
-  boot.loader.limine = lib.mkIf (!useSystemdBoot) {
+  # Limine bootloader (optional - prettier, more features)
+  boot.loader.limine = lib.mkIf useLimine {
     enable = true;
+
+    # Support both BIOS and UEFI
+    efiSupport = true;
+    biosSupport = true;
+
+    # Max generations to show
+    maxGenerations = 10;
+
+    # Disable editor for security (can be overridden)
+    enableEditor = false;
+
+    # Validate boot files
+    validateChecksums = true;
+    panicOnChecksumMismatch = false;
+
+    # Styling
+    style = {
+      # Background color (dark brown from classical theme)
+      backdrop = "1a1611";
+
+      # Wallpaper style
+      wallpaperStyle = "stretched";
+
+      # Boot wallpaper (optional - can be set by user)
+      wallpapers = lib.mkIf (builtins.pathExists ../../themes/classical/wallpapers/boot.png) [
+        ../../themes/classical/wallpapers/boot.png
+      ];
+
+      # Graphical terminal settings
+      graphicalTerminal = {
+        # Font (Limine uses built-in fonts)
+        # Background color (RRGGBB)
+        background = "1a1611";
+        # Foreground/text color
+        foreground = "d4c4a8";
+        # Bright foreground
+        brightForeground = "d4a857";
+      };
+
+      # Interface styling
+      interface = {
+        # Resolution (empty = auto)
+        resolution = "";
+        # Branding colors
+        brandingColor = "d4a857";  # Gold accent
+      };
+    };
+
+    # Extra config for branding
+    extraConfig = ''
+      # Nomarchy Bootloader
+      TIMEOUT=5
+      GRAPHICS=yes
+      VERBOSE=no
+    '';
+  };
+
+  # Kernel parameters (applied regardless of bootloader)
+  boot.kernelParams = [
+    "quiet"
+    "splash"
+    "loglevel=3"
+    "udev.log_level=3"
+  ];
+
+  # Plymouth boot splash (optional, works with both bootloaders)
+  boot.plymouth = lib.mkIf (nomarchyConfig.enablePlymouth or false) {
+    enable = true;
+    theme = "bgrt"; # Uses system logo
   };
 }