feat(home): add declarative Zed editor configuration

Manage Zed settings via home-manager programs.zed-editor module with
mutableUserSettings disabled for fully Nix-managed configuration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: stackptr

home/programs/default.nix

@@ -7,6 +7,7 @@
     ./aichat.nix
     ./starship.nix
     ./tmux.nix
+    ./zed.nix
     ./zsh.nix
   ];
 

home/programs/zed.nix

@@ -0,0 +1,235 @@
+{_}: {
+  programs.zed-editor = {
+    enable = true;
+    mutableUserSettings = false;
+    userSettings = {
+      auto_update = false;
+      theme = {
+        mode = "system";
+        light = "Nova Light";
+        dark = "Nova Dark";
+      };
+      icon_theme = "Zed (Default)";
+
+      ui_font_size = 15.0;
+      ui_font_family = ".SystemUIFont";
+      buffer_font_size = 12.0;
+      buffer_font_family = "MesloLGSDZ Nerd Font Mono";
+      buffer_line_height = "comfortable";
+      show_wrap_guides = true;
+      use_system_path_prompts = false;
+      diff_view_style = "unified";
+
+      title_bar = {
+        show_branch_icon = true;
+        show_branch_name = true;
+        show_project_items = true;
+        show_onboarding_banner = false;
+        show_user_picture = false;
+        show_user_menu = true;
+        show_sign_in = true;
+        show_menus = false;
+      };
+
+      current_line_highlight = "all";
+      gutter = {
+        line_numbers = true;
+        runnables = false;
+        breakpoints = false;
+        folds = true;
+        min_line_number_digits = 3;
+      };
+
+      indent_guides = {
+        enabled = true;
+        line_width = 1;
+        active_line_width = 1;
+        coloring = "indent_aware";
+        background_coloring = "disabled";
+      };
+      sticky_scroll = {enabled = true;};
+      git = {
+        inline_blame = {
+          enabled = true;
+          delay_ms = 0;
+          min_column = 0;
+          padding = 10;
+          show_commit_summary = true;
+        };
+      };
+      toolbar = {
+        breadcrumbs = true;
+        quick_actions = false;
+        selections_menu = false;
+        agent_review = false;
+        code_actions = false;
+      };
+
+      max_tabs = null;
+
+      tab_bar = {
+        show = true;
+        show_nav_history_buttons = false;
+        show_tab_bar_buttons = false;
+      };
+      tabs = {
+        git_status = true;
+        close_position = "left";
+        show_close_button = "hover";
+        file_icons = true;
+        show_diagnostics = "errors";
+        activate_on_close = "left_neighbour";
+      };
+      extend_comment_on_newline = false;
+
+      status_bar = {
+        active_language_button = true;
+        cursor_position_button = true;
+        line_endings_button = false;
+        active_encoding_button = "non_utf8";
+      };
+
+      snippet_sort_order = "inline";
+      show_completions_on_input = true;
+      show_completion_documentation = true;
+      auto_signature_help = false;
+      show_signature_help_after_edits = false;
+      inline_code_actions = true;
+      lsp_document_colors = "inlay";
+      completion_menu_scrollbar = "system";
+      colorize_brackets = true;
+
+      diagnostics_max_severity = "all";
+      diagnostics = {
+        button = true;
+        include_warnings = false;
+        inline = {
+          enabled = true;
+        };
+      };
+
+      edit_predictions = {
+        provider = "sweep";
+        mode = "eager";
+        enabled_in_text_threads = true;
+      };
+      show_edit_predictions = true;
+
+      load_direnv = "shell_hook";
+      double_click_in_multibuffer = "open";
+
+      file_finder = {
+        file_icons = true;
+        modal_max_width = "small";
+        git_status = true;
+        include_ignored = "smart";
+      };
+
+      project_panel = {
+        button = true;
+        default_width = 240;
+        dock = "left";
+        entry_spacing = "standard";
+        file_icons = true;
+        folder_icons = true;
+        git_status = true;
+        indent_size = 16;
+        auto_reveal_entries = true;
+        auto_fold_dirs = true;
+        bold_folder_labels = false;
+        sticky_scroll = true;
+        drag_and_drop = true;
+        scrollbar = {show = null;};
+        show_diagnostics = "errors";
+        indent_guides = {show = "always";};
+        sort_mode = "directories_first";
+        hide_root = false;
+        hide_hidden = false;
+      };
+      git_panel = {
+        tree_view = true;
+        button = true;
+        dock = "right";
+        status_style = "label_color";
+        fallback_branch_name = "main";
+        sort_by_path = false;
+        collapse_untracked_diff = false;
+        scrollbar = {show = null;};
+      };
+      terminal = {
+        toolbar = {breadcrumbs = false;};
+        dock = "bottom";
+        button = true;
+        blinking = "terminal_controlled";
+        cursor_shape = "block";
+        env = {};
+        scrollbar = {show = null;};
+        font_family = "MesloLGSDZ Nerd Font Mono";
+        max_scroll_history_lines = 10000;
+      };
+      collaboration_panel = {button = true;};
+      outline_panel = {button = false;};
+      notification_panel = {button = false;};
+      debugger = {button = false;};
+
+      prettier = {allowed = true;};
+      languages = {
+        JavaScript = {
+          tab_size = 2;
+          formatter = {
+            external = {
+              command = "prettier";
+              arguments = ["--stdin-filepath" "{buffer_path}"];
+            };
+          };
+          format_on_save = "on";
+        };
+        Nix = {
+          language_servers = ["nil" "!nixd"];
+          formatter = {
+            external = {
+              command = "alejandra";
+              arguments = ["--quiet" "--"];
+            };
+          };
+        };
+      };
+      lsp = {
+        eslint = {
+          settings = {
+            workingDirectory = {mode = "auto";};
+          };
+        };
+      };
+
+      agent = {
+        default_model = {
+          provider = "anthropic";
+          model = "claude-sonnet-4-6-latest";
+          enable_thinking = false;
+        };
+        favorite_models = [];
+        model_parameters = [];
+      };
+
+      context_servers = {
+        glyph = {
+          settings = {
+            url = "http://glyph:8090/mcp";
+          };
+        };
+      };
+
+      ssh_connections = [
+        {
+          host = "glyph";
+          username = "mu";
+          args = [];
+          projects = [
+            {paths = ["/home/mu/Development/rc"];}
+          ];
+        }
+      ];
+    };
+  };
+}