docs: add the notification renderers implementation plan

Plan two of two: the quickshell side of the notification daemon. The Notify
singleton reads the daemon's published files, a new notifications/ component
draws balloons and owns suppression, the drawer's reserved Item becomes the
live queue with a history page, and the Status page gains a snooze row.

Suppression lives in the balloon shell so the drawer can list what DND held
back, and the drawer flag is the single no-double-show mechanism. Per-id
history removal is a tracked TODO in the notifyd repo rather than an
untracked spec gap.

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