feat: add Home Manager refactoring plan and initial structure

- Add comprehensive Home Manager refactoring plan document
- Create initial Home Manager directory structure with user configs
- Add modular Emacs configuration for Home Manager integration
- Update system configurations for Home Manager compatibility
- Preserve existing functionality while preparing for migration

🤖 Generated with [Claude Code](https://claude.ai/code)

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

dotfiles/geir/emacs-config/init-nix.el

@@ -25,7 +25,9 @@
 (menu-bar-mode -1)
 (when (fboundp 'tool-bar-mode) (tool-bar-mode -1))
 (when (fboundp 'scroll-bar-mode) (scroll-bar-mode -1))
-(set-face-attribute 'default nil :height 100)
+(set-face-attribute 'default nil :height 110)
+;; Set text width to 140 characters
+(setq-default fill-column 140)
 (setq-default cursor-type 'bar)
 
 ;; Nix Integration Setup

dotfiles/geir/emacs-config/modules/completion.el

@@ -51,5 +51,13 @@
   (add-to-list 'completion-at-point-functions #'cape-dabbrev)
   (add-to-list 'completion-at-point-functions #'cape-file))
 
+;; All-the-icons completion (for icons in completion UI)
+(use-package all-the-icons-completion
+  :if (display-graphic-p)
+  :after marginalia
+  :config
+  (all-the-icons-completion-mode)
+  (add-hook 'marginalia-mode-hook #'all-the-icons-completion-marginalia-setup))
+
 (provide 'completion)
 ;;; completion.el ends here

dotfiles/geir/niri/config.kdl

@@ -277,7 +277,7 @@ spawn-at-startup "waybar"
 // Additionally, clients will be informed that they are tiled, removing some client-side rounded corners.
 // This option will also fix border/focus ring drawing behind some semitransparent windows.
 // After enabling or disabling this, you need to restart the apps for this to take effect.
-// prefer-no-csd
+prefer-no-csd
 
 // You can change the path where screenshots are saved.
 // A ~ at the front will be expanded to the home directory.