Add Emacs config with install scripts for laptop and work

Shared: init.el / early-init.el with Vertico stack, Corfu, Eglot,
treesit-auto, Catppuccin Mocha, doom-modeline, Magit, avy, harpoon,
embark, wgrep, expand-region, envrc, org-mode, and drop-in lang loader.

Lang configs split by stow target:
- shared: elisp, org
- laptop: C/C++, Rust, Go, LaTeX (AUCTeX + latexmk + Zathura)
- work:   C#, JS/TS/HTML/CSS/React (apheleia+prettier), Copilot

install-personal.sh: Fedora — gcc/clang, rustup, Go, texlive, zathura
install-work.sh: Ubuntu 24.04 WSL — dotnet-sdk-10.0, Node 22 via nvm, ts-ls

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

work/.config/emacs/lisp/langs/copilot.el

@@ -0,0 +1,16 @@
+;;; lisp/langs/copilot.el --- GitHub Copilot  -*- lexical-binding: t -*-
+
+;; copilot.el is not on MELPA; installed via package-vc (Emacs 29+)
+(use-package copilot
+  :vc (:url "https://github.com/copilot-emacs/copilot.el" :rev :newest)
+  :hook (prog-mode . copilot-mode)
+  :bind (:map copilot-completion-map
+              ;; copilot-completion-map is only active when ghost text is showing,
+              ;; so these bindings don't interfere with Corfu's popup
+              ("<tab>" . copilot-accept-completion)
+              ("TAB"   . copilot-accept-completion)
+              ("M-f"   . copilot-accept-completion-by-word)
+              ("M-n"   . copilot-next-completion)
+              ("M-p"   . copilot-previous-completion))
+  :custom
+  (copilot-idle-delay 0.5))

work/.config/emacs/lisp/langs/csharp.el

@@ -0,0 +1,9 @@
+;;; lisp/langs/csharp.el --- C#  -*- lexical-binding: t -*-
+
+;; csharp-ts-mode is built-in since Emacs 29
+(with-eval-after-load 'eglot
+  (add-to-list 'eglot-server-programs
+               '((csharp-mode csharp-ts-mode) . ("csharp-ls"))))
+
+(dolist (hook '(csharp-mode-hook csharp-ts-mode-hook))
+  (add-hook hook #'eglot-ensure))

work/.config/emacs/lisp/langs/web.el

@@ -0,0 +1,42 @@
+;;; lisp/langs/web.el --- JS / TS / HTML / CSS / React  -*- lexical-binding: t -*-
+
+;; web-mode for JSX, TSX, and HTML template files
+(use-package web-mode
+  :mode (("\\.jsx\\'"  . web-mode)
+         ("\\.tsx\\'"  . web-mode)
+         ("\\.html?\\'" . web-mode))
+  :custom
+  (web-mode-markup-indent-offset 2)
+  (web-mode-css-indent-offset    2)
+  (web-mode-code-indent-offset   2))
+
+;; typescript-language-server handles JS, TS, JSX, TSX
+(with-eval-after-load 'eglot
+  (add-to-list 'eglot-server-programs
+               '((js-mode js-ts-mode typescript-ts-mode tsx-ts-mode web-mode)
+                 . ("typescript-language-server" "--stdio")))
+  (add-to-list 'eglot-server-programs
+               '((html-mode mhtml-mode)
+                 . ("vscode-html-language-server" "--stdio")))
+  (add-to-list 'eglot-server-programs
+               '((css-mode css-ts-mode)
+                 . ("vscode-css-language-server" "--stdio"))))
+
+(dolist (hook '(js-mode-hook js-ts-mode-hook
+                typescript-ts-mode-hook tsx-ts-mode-hook
+                web-mode-hook
+                html-mode-hook mhtml-mode-hook
+                css-mode-hook css-ts-mode-hook))
+  (add-hook hook #'eglot-ensure))
+
+;; Async formatting via Prettier (apheleia runs formatters without blocking)
+(use-package apheleia
+  :hook ((js-mode           . apheleia-mode)
+         (js-ts-mode        . apheleia-mode)
+         (typescript-ts-mode . apheleia-mode)
+         (tsx-ts-mode       . apheleia-mode)
+         (css-mode          . apheleia-mode)
+         (css-ts-mode       . apheleia-mode)
+         (web-mode          . apheleia-mode))
+  :config
+  (setf (alist-get 'web-mode apheleia-mode-alist) '(prettier)))