docs: merge notification system docs into single Native-First guide

- Consolidate 5 notification-system-* files into doc/notification-system.md
- Add web-push cleanup guide and Start-on-Login glossary entry
- Configure markdownlint for consistent formatting
- Remove web-push references, focus on native OS scheduling

Reduces maintenance overhead while preserving all essential information
in a single, well-formatted reference document.

src/views/AccountViewView.vue

@@ -811,6 +811,7 @@ import { logger } from "../utils/logger";
 import { PlatformServiceMixin } from "../utils/PlatformServiceMixin";
 import { createNotifyHelpers, TIMEOUTS } from "@/utils/notify";
 import { ACCOUNT_VIEW_CONSTANTS } from "@/constants/accountView";
+import { showSeedPhraseReminder } from "@/utils/seedPhraseReminder";
 import {
   AccountSettings,
   isApiError,
@@ -1699,6 +1700,14 @@ export default class AccountViewView extends Vue {
       );
       if (success) {
         this.notify.success(ACCOUNT_VIEW_CONSTANTS.SUCCESS.PROFILE_SAVED);
+
+        // Show seed phrase backup reminder if needed
+        try {
+          const settings = await this.$accountSettings();
+          showSeedPhraseReminder(!!settings.hasBackedUpSeed, this.$notify);
+        } catch (error) {
+          logger.error("Error checking seed backup status:", error);
+        }
       } else {
         this.notify.error(ACCOUNT_VIEW_CONSTANTS.ERRORS.PROFILE_SAVE_ERROR);
       }