Mirrors the Tmux keybindings menu on SUPER + ALT + K. Herdr has no CLI
that dumps resolved bindings, so the action list and its defaults come
from `herdr --default-config`, where every action appears as a commented
assignment, and the user config overrides what it sets.
Prose in that default config can read like an assignment, as in
`# type = "popup" opens a session-modal terminal`, so a line counts only
when its value is a bare string or an array of them. Both TOML quote
characters open a string, and with no config file at all the listing
shows Herdr's own defaults rather than the Omarchy seed config Herdr
never loaded.
