feat(signal): route message toasts through the notify script

Incoming messages now notify through cj/signel--notify, installed as the fork's signel-notify-function. It suppresses the toast while that chat is in the selected window of a focused frame, collapses and truncates the body to 120 characters, and sends through the notify script (info type, --silent unless cj/signel-notify-sound is set). Without the script on PATH it falls back to notifications-notify and warns at load. The decisions are in the Notification slice addendum of docs/design/signal-client.org.

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