Modify tmux config/setup, zsh, some nvim & skhd key mappings, etc

src_files/.config/zsh/.zshenv

@@ -4,8 +4,11 @@ export EDITOR='nvim'
 
 # env vars used for my organization structure
 export DIR_HOME_BOX="$HOME/dbox"
+export DIR_MUSIC="$DIR_HOME_BOX/media/music"
 export DIR_DEV="$HOME/dev"
 export DIR_GIT_PROJECTS="$DIR_DEV/git"
+export DIR_SCRATCH_NOTES="$DIR_HOME_BOX/life/scratchpad/notes"
+export DIR_SCRATCH_DRAWINGS="$DIR_HOME_BOX/life/scratchpad/drawings"
 
 # util dirs; do not change without checking impact on xdg base dirs
 export DIR_LOCAL="$HOME/.local"