snooze: add UI elements and DB for snooze functionality

server/migrations/20250630023836_snooze.up.sql

@@ -0,0 +1,6 @@
+-- Add up migration script here
+CREATE TABLE IF NOT EXISTS snooze (
+    id integer NOT NULL GENERATED ALWAYS AS IDENTITY,
+    message_id text NOT NULL,
+    wake timestamptz NOT NULL
+);