Split laptop/work into independent stow packages with shared/ base

- Remove work/laptop detection logic from nvim and emacs configs; each
  package now has a self-contained init that requires no runtime checks
- Create shared/ stow package containing nvim/init.lua, emacs/init.el,
  common-dev-settings.el, org-bindings.el, tmux, ghostty, and ranger
- Rename laptop-languages.lua / work-languages.lua → languages.lua in
  each package; shared/init.lua uses require('languages') generically
- Rename work-dev-settings.el → dev-settings.el to match laptop naming
- Expand work/ to include the full set of dev tools (tmux, ghostty,
  ranger, emacs, neovim) without email/calendar tooling
- Add Makefile with `make laptop` and `make work` targets (each runs
  a single `stow shared <profile>` invocation)

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

shared/.config/tmux/tmux.conf

@@ -0,0 +1,56 @@
+# tmux.conf — vim-style keybindings
+
+# Prefix
+set -g prefix C-Space
+unbind C-b
+bind C-Space send-prefix
+
+# Splits
+unbind '"'
+unbind %
+bind s split-window -v -c "#{pane_current_path}"
+bind v split-window -h -c "#{pane_current_path}"
+
+# Close
+bind x kill-pane
+
+# Pane navigation: prefix+hjkl and M-hjkl without prefix
+bind h select-pane -L
+bind j select-pane -D
+bind k select-pane -U
+bind l select-pane -R
+
+bind -n M-h select-pane -L
+bind -n M-j select-pane -D
+bind -n M-k select-pane -U
+bind -n M-l select-pane -R
+
+# Copy mode with vi keys
+set-window-option -g mode-keys vi
+
+# General
+set -g mouse on
+set -g history-limit 10000
+set -sg escape-time 0        # no delay for escape — important for vim
+set -g focus-events on
+set -g default-terminal "tmux-256color"
+set -as terminal-overrides ',*:Tc'  # true color passthrough
+set -g xterm-keys on                # pass modified keys (S-Arrow etc.) to inner apps
+
+set -g base-index 1
+set -g pane-base-index 1
+set -g renumber-windows on
+
+# Status bar — catppuccin mocha
+set -g status-style "bg=#1e1e2e fg=#cdd6f4"
+set -g status-left "#[fg=#89b4fa,bold] #S  "
+set -g status-right "#[fg=#a6e3a1]#H  #[fg=#cdd6f4]%H:%M "
+set -g status-left-length 30
+
+set -g window-status-format         "#[fg=#6c7086] #I #W "
+set -g window-status-current-format "#[fg=#cdd6f4,bold] #I #W "
+
+set -g pane-border-style        "fg=#313244"
+set -g pane-active-border-style "fg=#89b4fa"
+
+set -g message-style "bg=#313244 fg=#cdd6f4"