feat(units): seed user unit lists from managed drop-ins

Curate the user units whose definitions or overrides we manage under
dot_config/systemd/user/:

- graphical.txt: cliphist-{image,text}, display-watcher, swayidle,
  waybar — all WantedBy=sway-session.target.
- mail.txt: protonmail-bridge.service — managed via a drop-in override.

Also extend user/.ignore with the socket-activated pipewire/wireplumber
stack and a handful of distro defaults so 'just unit-status' stays
quiet on a clean system.

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