Web Push reminders for tasks and events (Settings -> Reminders)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -20,6 +20,7 @@ jobs:
       - run: npm audit --omit=dev --audit-level=high
       - run: node tools/smoke-test.js
       - run: node tools/tasks-test.js    # repeating tasks and subtasks
+      - run: node tools/push-test.js     # reminders: when they are sent, never twice
       - run: node tools/users-test.js   # accounts: private data, tab limits, invites, migration
       - run: node tools/plex-test.js    # Plex sign-in stays signed in and repairs itself
       - run: node tools/player-test.js  # music player: queue, shuffle/repeat, stall recovery