feat(frontend): critical alerts UI

backend/migrations/20241105225151_alert_add_acknowledged.down.sql

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+ALTER TABLE alerts DROP COLUMN acknowledged;

backend/migrations/20241105225151_alert_add_acknowledged.up.sql

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+-- Step 1: Add the new column 'acknowledged' to the 'alerts' table
+ALTER TABLE alerts
+ADD COLUMN acknowledged BOOLEAN DEFAULT NULL;
+
+-- Step 2: Update all existing rows to set 'acknowledged' to true
+-- we don't want to pop up notifications to all users after migrations
+-- but only show new alerts from the point of the upgrade
+UPDATE alerts
+SET acknowledged = TRUE;