feat(config): split tmux config, add helpers

config/tmux/theme-activate.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#
+# If our dark/light theme switching theme file can be found,
+# source it in tmux. This is a separate file to keep the
+# current theme settings separate from the main tmux configuration.
+#
+# This script requires the following in your tmux.conf:
+# `run-shell "./theme-activate.sh"`
+# and having the tmux-dark-notify plugin installed.
+#
+# Author: Ismo Vuorinen <https://github.com/ivuorinen> 2025
+# License: MIT
+
+THEME_FILE="$HOME/.local/state/tmux/tmux-dark-notify-theme.conf"
+
+[[ -e $THEME_FILE ]] && tmux source-file "$THEME_FILE"