feat(notifications): wire pruneDeadTokens into streakReminder

functions/src/notifications/streakReminder.ts

@@ -1,6 +1,7 @@
 import * as functions from 'firebase-functions'
 import * as admin from 'firebase-admin'
 import { recipientInQuietHours } from './quietHours'
+import { pruneDeadTokens } from './pruneTokens'
 
 /**
  * Streak reminder — an evening "don't lose your streak" nudge.
@@ -120,6 +121,8 @@ async function sendStreakNudge(
       console.warn(`[sendStreakReminder] FCM failed for token ${tokens[i]}:`, result.reason)
     }
   })
+
+  await pruneDeadTokens(db, userId, tokens, sendResults)
 }
 
 /** YYYY-MM-DD for the given instant in America/Chicago (DST-safe; en-CA gives ISO date order). */