feat: nixvim + zsh, fix: warnings

nixos/module/hectic/program/zsh.nix

@@ -0,0 +1,51 @@
+{
+  inputs,
+  flake,
+  self,
+}: {
+  pkgs,
+  lib,
+  config,
+  ...
+}: let
+  cfg = config.hectic.program.zsh;
+in {
+  imports = [
+    inputs.home-manager.nixosModules.home-manager
+  ];
+
+  options.hectic.program.zsh.enable = lib.mkEnableOption "Enable hectic zsh config";
+
+  config = lib.mkIf cfg.enable {
+    # system-level zsh must be on for home-manager zsh to work
+    programs.zsh.enable = true;
+    users.defaultUserShell = pkgs.zsh;
+
+    home-manager.users.root = {
+      home.stateVersion = lib.mkDefault "25.05";
+
+      programs.zsh = {
+        enable               = true;
+        enableCompletion     = true;
+        autosuggestion.enable = true;
+        syntaxHighlighting.enable = true;
+
+        history = {
+          size = 10000;
+          path = "$HOME/.zsh/.zsh_history";
+        };
+
+        oh-my-zsh = {
+          enable = true;
+          theme  = "terminalparty";
+        };
+
+        shellAliases = self.lib.sharedShellAliases;
+
+        initContent = ''
+          set -ovi
+        '';
+      };
+    };
+  };
+}