chore(config): Refactor Emacs config for cross-platform compatibility

Add Android/Termux support with `*is-android*` constant and
conditional GUI/terminal initialization. Remove maximized frame
defaults and custom.el. Replace corfu with corfu-terminal in
TTY. Add god-mode to terminal config with line number sync. Update
org agenda to use org-ql blocks with super-agenda grouping. Switch
solarized-theme to fork. Clean up redundant functions and unify
keyboard bindings across environments.

custom.el

@@ -1,33 +0,0 @@
-;;; -*- lexical-binding: t -*-
-(custom-set-variables
- ;; custom-set-variables was added by Custom.
- ;; If you edit it by hand, you could mess it up, so be careful.
- ;; Your init file should contain only one such instance.
- ;; If there is more than one, they won't work right.
- '(custom-safe-themes
-   '("7fea145741b3ca719ae45e6533ad1f49b2a43bf199d9afaee5b6135fd9e6f9b8"
-     default))
- '(package-selected-packages
-   '(ace-window benchmark-init cape cnfonts corfu crux drag-stuff eglot
-		embark-consult everything exec-path-form-shell gcmh
-		hungry-delete marginalia multiple-cursors orderless
-		restart-emacs smart-mode-line solarized-theme vertico))
- '(safe-local-variable-values
-   '((eval read-only-mode t) (eval jinx-mode nil)
-     (eval visual-line-mode nil)
-     (eval when (fboundp 'rainbow-mode) (rainbow-mode 1))
-     (gptel-mode . t)
-     (eval progn
-	   (setq org-hugo-base-dir
-		 (if (eq system-type 'windows-nt)
-		     "h:/emacs/hugo/this-is-my-blog/"
-		   "~/org/hugo/this-is-my-blog/"))
-	   (org-hugo-auto-export-mode))
-     (org-use-tag-inheritance)))
- '(warning-suppress-log-types '((initialization))))
-(custom-set-faces
- ;; custom-set-faces was added by Custom.
- ;; If you edit it by hand, you could mess it up, so be careful.
- ;; Your init file should contain only one such instance.
- ;; If there is more than one, they won't work right.
- )