refactor: archive old features directory to features.old

The new profile-based structure (home/base, home/desktop, home/server,
home/profiles/, home/coding) is fully operational and imported via
home/lib/mkHomeConfig. The legacy home/features directory is no longer
referenced anywhere in the configuration.

Archived rather than deleted to preserve history for reference.

home/features.old/cli/fzf.nix

@@ -0,0 +1,40 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.features.cli.fzf;
+in {
+  options.features.cli.fzf.enable = mkEnableOption "enable fuzzy finder";
+
+  config = mkIf cfg.enable {
+    programs.fzf = {
+      enable = true;
+      enableFishIntegration = true;
+      colors = {
+        "fg" = "#${config.colorScheme.palette.base05}";
+        "bg" = "#${config.colorScheme.palette.base00}";
+        "hl" = "#${config.colorScheme.palette.base0E}";
+        "fg+" = "#${config.colorScheme.palette.base05}";
+        "bg+" = "#${config.colorScheme.palette.base02}";
+        "hl+" = "#${config.colorScheme.palette.base0E}";
+        "info" = "#${config.colorScheme.palette.base09}";
+        "prompt" = "#${config.colorScheme.palette.base0B}";
+        "pointer" = "#${config.colorScheme.palette.base08}";
+        "marker" = "#${config.colorScheme.palette.base08}";
+        "spinner" = "#${config.colorScheme.palette.base09}";
+        "header" = "#${config.colorScheme.palette.base03}";
+      };
+      defaultOptions = [
+        "--preview='bat --color=always -n {}'"
+        "--bind 'ctrl-/:toggle-preview'"
+        "--header 'Press CTRL-Y to copy command into clipboard'"
+        "--bind 'ctrl-/:toggle-preview'"
+        "--bind 'ctrl-y:execute-silent(echo -n {2..} | wl-copy)+abort'"
+      ];
+      defaultCommand = "fd --type f --exclude .git --follow --hidden";
+      changeDirWidgetCommand = "fd --type d --exclude .git --follow --hidden";
+    };
+  };
+}