refactor(modules): organize module tree

modules/shell/tmux/extra.conf

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+# Copy-mode selections land in the system clipboard via the terminal's own
+# OSC52 escape sequence.
+set -g set-clipboard on
+
+bind -T copy-mode-vi v send -X begin-selection
+bind -T copy-mode-vi y send -X copy-selection-and-cancel
+bind -T copy-mode-vi MouseDragEnd1Pane send -X copy-selection-and-cancel
+
+# \ splits the pane side-by-side, - splits it stacked.
+# Both open the new pane in the current pane's directory, as does c for a new window.
+unbind %
+unbind '"'
+bind \\ split-window -h -c "#{pane_current_path}"
+bind - split-window -v -c "#{pane_current_path}"
+bind c new-window -c "#{pane_current_path}"
+
+bind h select-pane -L
+bind j select-pane -D
+bind k select-pane -U
+bind l select-pane -R
+
+set -g renumber-windows on
+
+bind r source-file ~/.config/tmux/tmux.conf \; display-message "tmux.conf reloaded"
+
+# Advertise RGB (true-color) capability for every terminal type.
+set -ag terminal-overrides ",*:RGB"
+
+# monitor-bell flags a background window in the status bar when it rings the
+# terminal bell while unfocused.
+# bell-action=none suppresses the actual BEL (no beep or flash).
+# The per-window status highlight is independent of it.
+setw -g monitor-bell on
+set -g bell-action none
+
+# Minimal status bar: session name plus window list only.
+# Colours are left to Stylix.
+set -g status-position bottom
+set -g status-left " #S "
+set -g status-left-length 20
+set -g status-right ""
+setw -g window-status-current-format " #I:#W "
+setw -g window-status-format " #I:#W "

modules/shell/tmux/tmux.nix

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+{
+  config,
+  lib,
+  ...
+}:
+# tmux for the primary user, configured through home-manager.
+# Settings without a home-manager option are read from ./extra.conf.
+let
+  cfg = config.modules.shell.tmux;
+  user = config.user.name;
+in
+{
+  options.modules.shell.tmux.enable = lib.mkEnableOption "tmux, configured via home-manager";
+
+  config = lib.mkIf cfg.enable {
+    registry.shell-shortcut.${config.networking.hostName}.tmx = "tmux new-session -A -s";
+
+    home-manager.users.${user}.programs.tmux = {
+      enable = true;
+
+      prefix = "C-Space";
+      keyMode = "vi";
+      mouse = true;
+      baseIndex = 1;
+      clock24 = true;
+      escapeTime = 10; # short Esc delay so exiting insert mode in nvim isn't laggy.
+      historyLimit = 10000;
+      terminal = "tmux-256color";
+
+      extraConfig = builtins.readFile ./extra.conf;
+    };
+  };
+}