refactor: Reorganize config with use-package and optimize startup hooks

- Split monolithic init-package.el into focused modules
- Convert eager `:init` blocks to lazy `:hook`
- Consolidate UI settings and defer theme loading.
- Remove duplicated config between GUI and terminal paths.

lisp/init-window.el

@@ -4,13 +4,18 @@
 
 ;;; Code:
 
+(use-package window
+  :straight nil
+  :config
+  (setq switch-to-buffer-obey-display-actions t))
+
 (use-package popper
   :defines
   popper-echo-dispatch-actions
   :commands
   popper-group-by-directory
   :hook
-  (emacs-startup . popper-mode)
+  (after-init . popper-mode)
   
   :init
   (setq popper-reference-buffers
@@ -90,9 +95,9 @@
   (when (display-grayscale-p)
     (setq popper-mode-line
           '("[POP]")))
-
   (setq popper-echo-dispatch-actions t)
   (setq popper-group-function nil)
+
   :config
   (popper-echo-mode 1)