feat(home-manager): add starship prompt and reorganize CLI features

- Move zsh configuration from global/ to features/cli/
- Add starship.nix with custom prompt configuration
  - Left prompt: username@hostname, directory, git status, vi-mode indicator
  - Right prompt: language/environment indicators (C, direnv, Haskell, Bun, Python, Rust)
  - Git status with semantic colors (green=staged, yellow=modified/untracked, red=conflicted/deleted, cyan=stashed/renamed)
  - Vi-mode aware prompt character (red heart in insert, blue in normal)
- Update features/cli to import starship via zsh.nix
- Remove empty imports section from global/default.nix

home-manager/sajenim/global/default.nix

@@ -2,10 +2,6 @@
 # This module provides base user settings, nixpkgs configuration, and core imports
 # that are inherited across all hosts where this user is configured.
 {outputs, lib, ...}: {
-  imports = [
-    ./zsh.nix # Shell configuration and plugins
-  ];
-
   # Nixpkgs configuration - applies overlays and sets package acceptance policy
   nixpkgs = {
     # Apply custom overlays to extend/modify the package set

home-manager/sajenim/global/zsh.nix

@@ -1,53 +0,0 @@
-{pkgs, ...}: {
-  home.packages = with pkgs; [
-    fzf # command-line fuzzy finder
-  ];
-
-  programs.zsh = {
-    enable = true;
-
-    # Enable extra features
-    autosuggestion = {
-      enable = true;
-    };
-    syntaxHighlighting = {
-      enable = true;
-    };
-    enableCompletion = true;
-
-    # Configuration directory
-    dotDir = ".config/zsh";
-
-    shellAliases = {
-      # Single letter aliases
-      c = "clear";
-      v = "nvim";
-
-      # Double letter aliases
-      la = "ls -a";
-      ll = "ls -l";
-    };
-
-    # Install plugins
-    plugins = [
-      { # vi(vim) mode for ZSH
-        name = "zsh-vi-mode";
-        src = "${pkgs.zsh-vi-mode}/share/zsh-vi-mode";
-      }
-
-      { # replace zsh's completion with fzf
-        name = "fzf-tab";
-        src = "${pkgs.zsh-fzf-tab}/share/fzf-tab";
-      }
-    ];
-
-    # Extra commands that should be added to '.zshrc'
-    initContent = ''
-      eval "$(direnv hook zsh)"
-      bindkey "^[[1;5C" forward-word
-      bindkey "^[[1;5D" backward-word
-      export PATH
-      PROMPT='%F{blue}%n@%m %F{cyan}%~ %F{red}♥ %f';
-    '';
-  };
-}